Understanding-the-difference-between-Hot-dipped-galvanized-and-Cold-Galvanizing-steel-

Understanding the difference between Hot dipped galvanized and Cold Galvanizing steel

Businesses dealing with metals like iron, aluminum, copper and more for the purpose of product development and service-related issues always faces the harsh reality of corrosion a challenge that disrupts the natural flow of these businesses. The process of corrosion highlights a naturally occurring phenomenon where refined metals are naturally converted into more stable composition when comes in contact with air, moisture, humidity and other natural elements to form oxide, sulphide and hydroxide state. These states even though create a more stable composition, but ends up decaying the metal from outside in or inside out. This usually results in weakening of the structure developed with the usage of metal, or result in decaying the metal to such an extent, that it becomes impossible to use the metal for any other function. It is because of the challenges laid down by the process of corrosion on metals, organization’s dealing in metal businesses often have to suffer huge financial losses resulting in loss of goodwill, loss related metal decay and more. It is because of this reason a solution was brought in by metal businesses throughout the globe with the advancement of technology. The solution was galvanization of the metal a solution discovered in 1742 by Melouin a French chemist, where he highlights the application of zinc on the metal surfaces to increase the longevity of the metal. Even though this application of zinc on metal dates back to 2500 B.C. but the discovery of 1742 laid the foundation of exploring the zinc application on metal to the extent where application methods used could result in a change of the timeline for metal longevity. Over the years of technological changes and chemical research two significant approaches of zinc application were discovered, hot and cold dip which functions as a pivotal discovery to today’s galvanization process in the industry.   

The approaches to the process of galvanization on metals as signified earlier are of two types they are hot and cold dip galvanizing. Where both the approaches are ideal for protection against corrosion, but it is thoroughly based on your business requirement you should decide which galvanizing process you should take into account to create a protective layer for your metals used in the business. 

Let’s take a look at what galvanization is and how hot and cold dip galvanizing differs from each other.   

What is Galvanization?

For the common approach of understanding galvanizing process refers to the approach that highlights the application of a zinc coating to the surface of a metal. The usual metal taken into consideration for the process of galvanization are Iron (Fe) and Zinc (Zn). The process of galvanization is principally utilized as a defensive mechanism to prevent corrosion and, likewise, increment the workable existence of the secured metal segment. When appropriately applied to a steel surface, zinc coatings offer two main types of protection: galvanic protection and barrier protection, which in turn increases the longevity of the metal by protecting it against possible corrosion. 

Understanding Barrier Protection

Barrier protection signifies the application of zinc on the surface of metal like steel, where the applied zinc hardens over time to create a sheet of layer on the steel. This sheet of layer acts as a protective agent for the steel by conversion of zinc into zinc oxide through the process of surface electrolyte. The hardened zinc oxide layer in turn protects the steel from corrosion against the electrolyte process that usually takes place when the metal comes in surface contact with air and moisture. This protection layout of barrier protection usually takes place because zinc oxide is impervious to moisture and air. This results in preventing the underlying steel to come in contact with air and moisture, which in turn prevents it from further corrosion and increasing its life to a great extent. 

Understanding Galvanic Protection

Galvanic protection, also known as cathodic protection, protects the underlying steel substrate by corroding preferentially, thus sacrificing itself in the process. This sort of protection is particularly helpful for circumstances where the protected steel may get exposed because of scratches, cuts, marks or loss of coating due to rigorous usage. Since zinc is an exceptionally receptive and electronegative metal, it will assume the role of the anode, which will result it to be corroding first in an event where the steel underneath get exposed to surface contact. This process of approach by zinc will continue to offer galvanic protection until the coating is entirely consumed. This in turn protect the underlying steel for a longer period of time safeguarding it from exposure surface electrolyte process because of chemical balance that has created an equilibrium because of chemical approach that has been applied in covering the steel in the galvanic process, unlike that of barrier protection, where sheet layer removal can expose the steel to vulnerability. 

This chemical approach to protection under galvanic process is divided into particular application methodology they are hot and cold dip galvanizing process. Let’s take a look at how each of these processes functions and how they provide protection to the underlying metal. 

Hot Dip Galvanization

Hot-dip galvanizing process is one of the most used application of galvanizing process. This process highlights coating a steel or iron object by submerging it into a bath of molten zinc. The bath of molten zinc showcases temperatures around 840°F (449°C). Once removed from the bath, the zinc coating on the iron or steel’s exterior reacts with oxygen in the atmosphere to form (ZnO) Zinc oxide. This Zinc oxide further reacts with carbon dioxide in the atmosphere to form a more compact protective layer known as (ZnCO3) Zinc carbonate. This Zinc carbonate reflects a dull grayish film, which is relatively stable and adheres tightly to the surface of the steel or iron. This results in the hot-dip galvanizing process to create a chemical balance, which ensures that the zinc is chemically bonded to the underlying metal and becomes part of the steel or metal that is being protected through the hot dip galvanizing process.

How Hot Dip Galvanization is performed

Though the concept of hot-dip galvanizing may seem simple, the process consists of several crucial steps. The steel first goes through three cleaning stages to prepare its surface for galvanizing; these are degreasing, pickling and fluxing. Degreasing is used to remove dirt, oil and other organic residues; a mild acid bath, or pickling, etches the steel and removes mill scale and iron oxide; and fluxing further removes any oxides and coats the steel with a protective layer that prevents the formation of further oxides on the steel surface prior to galvanizing. Once the cleaning process is completed, and the structure has dried, it is ready to be immersed into the molten zinc bath. Molten zinc flows in and around the iron or steel object, thus thoroughly coating it to protect all surfaces. The coated material is then removed from the bath and air-dried before inspection. 

Cold Dip Galvanization

Cold dip galvanizing is comparatively a much simpler process. The cold dip galvanizing process showcases application of a zinc-rich paint to the surface of a metal or steel element to protect it from corrosion. As such, the term “cold galvanizing” is considered to be a misnomer among some professionals in the coating industry. Zinc paints may be applied by brushes, rollers, spray guns, etc. Coatings may also be applied by the electro galvanizing:”Electro galvanizing is an electroplating technique used to place a layer of zinc metal on top of a steel surface. It involves immersing a steel component into a solution containing zinc salts followed by the application of electricity to induce an electrochemical reaction on top of the steel. The cold dip approach in comparison to hot dip galvanization process, the electro galvanizing approach provides a thinner coating and more aesthetic appearances.” method as well. The zinc-rich paints used in cold galvanizing are different from conventional coatings due to the presence of a binding compound. These binders allow the zinc to mechanically bond to the steel to offer an effective level of protection.

How Cold Dip Galvanizing is performed

Like hot-dip galvanizing, cold galvanizing can provide barrier protection and also some degree of cathodic protection. However, the zinc dust present in the paint or coating must be in high enough concentrations to promote electrical conductivity between the steel and the zinc. The surface preparation required for applying zinc-rich coatings is less demanding than hot-dip techniques. Before coatings operations begin, the surface of the steel must be clean and dry. Usually, a wire brush is first used to remove rust or any other corrosion products that may be present. Dirt, grease, chemicals and other organic compounds must also be removed accordingly. Once the surface is prepared, the zinc coating is applied to the surface in as many coats as required.

The introspection across both hot dip and cold dip galvanizing process clearly showcases how each of the approach is thoroughly different from other even though the processes aims at a common resolution of protecting metal from corrosion. The introspection throw light on how the hot dip is a chemical approach and more long lasting, while cold dip is a more physical surface contact approach, but less consistent in comparison to hot dip. 

If you are into metal businesses related to services and product then galvanization process is a must for your organization. The choice of your galvanizing approach for your metal thoroughly depends on your organizational requirement, however if you want to know more about galvanization and which approach will compliment your business, please get in touch with us. 

Why Choose Us

At Galvanizer our team work relentlessly to come up with innovation’s that can deliver you ultimate experience of galvanized products. Our multi-lateral testing and development process ensures delivering our client premiere quality of galvanizing process. With decades of industry experience we offer nothing but the best. We provide assistance in helping you select the best solution for your metal business. To know more on service and business-related inquiry get in touch with us. 

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Galvanizing Steel Is Sustainable And A Must For Your Business

Businesses all around the world are shifting towards the use of steel rather than iron for a more durable and long lasting structure. One of the main reasons behind this is the longevity that comes with galvanized steel and quality that galvanized delivery even when it comes in contact with reactive agents. It is because of these long lasting properties of galvanized steel along with its noble property it is used and opted across different industries. If you are into business where requirement of durable metal is a must, then you should look forward to invest in galvanized steel for sustainability and larger flexibility for your business. 

Let’s introspect what is galvanized steel and why it is a must for your business.

What is Galvanized Steel?

Galvanized steel is a type of metal that has been developed by coating layer of zinc onto steel. This coating of zinc on to steel is carried out using two galvanizing process hot dip galvanizing and cold galvanizing. In either of cases Galvanized steel is developed with the purpose of protecting against rust and corrosion. It is based on the requirement of business one should select wisely whether to use hot or cold galvanized steel to fulfill their business requirement. 

How Galvanized Steel provides Benefits and Flexibility to your Business

Galvanized steel has multiple usages in a business and can be used to replace even other materials that are deemed expensive or damaged. The supplement of galvanized steel not only provides economical resolution but also provide larger flexibility to business because of its properties. Some of the major benefits of using Galvanized steel are reflected below:

  • Sustainability
  • Durability
  • Proven Quality
  • Cost Effectiveness
  • Honesty
  • Reliability
  • Complete Coverage
  • Predictability
  • Triple protection
  • Toughness
  • Faster Turnaround  

These benefits signified by the galvanized steel ensure a quality advantageous position for your business. Let’s introspect how each of these quality ensure sustainability of galvanized steel, making it a must for your business. 

Sustainability of Galvanized Steel 

The long-term durability provided by galvanizing is achieved at relatively low environmental burden in terms of energy and other globally relevant impacts. One of the main reason behind this being non galvanized steel or other metals has to be maintained from time to time against corrosion and followed up with color to ensure long lasting vendetta. The usage of galvanized steel ensure protection against corrosion resulting in lower maintenance cost ensuring usage of the budget elsewhere, while protecting the environment from harmful fumes of re-coloring over and over again.  

Durability of Galvanized Steel

A galvanized coating is one of the most durable forms of corrosion protection on the market. One of the main reasons behind this is galvanized steel ensures removal all kind of impurities from within the steel. Further, with the process of galvanizing, steel results in getting an additional coating of 85mm if the steel used is 6mm thick. This 85mm coating is corrosion proof against majority of rusting and corrosive agent for a long period of time, making the galvanized steel long lasting and durable.  

Proven Quality of Galvanized Steel

Galvanizing is all around us, with the galvanizing of steel different industry recording increased production over the years. From the smallest to the largest elements, galvanized steel define itself from time to time as trustworthy and reliable, with a track record and proven performance, which is rigorously tested through expert monitoring and performance data collection defining 0.01m² corrosion rates for every 10km².

Cost Effectiveness of Galvanized Steel

The cost of protecting steel from corrosion takes into consideration two important elements, the initial cost of protection and the lifetime cost. On a comparison scale of coloring to that of galvanizing the cost of galvanizing showcases 35% lower lost based on average of initial cost and life time cost. This results in large scale saving for businesses in long run resulting in a cost effective solution for the business.   

Honesty of Galvanized Steel

The metallurgical bond that is framed when steel is plunged into liquid zinc; an aroused covering offers direct, secure assurance consistently. Hot galvanizing sans uncontaminated steel for the rusting cycle to reappear, it is because of this reason failure from underneath with galvanizing steel is almost impossible, making the galvanized steel an ideal material for all season. This surety of protection ensures a consistent honesty of with the usage of galvanized steel. 

 

Reliability of Galvanized Steel

Galvanizing of steel is a relatively controlled process. This makes the coating a consistent, process. It is because of this reason galvanizing steel is most reliable when it comes to corrosion protection. It is mainly because galvanizing is a metallurgical process that creates a metallurgical bonding rather than chemical or mechanical bonding making the zinc and steels a single structure. This ensures a thorough reliability with galvanized steel.  

Complete Coverage of Galvanized Steel

Galvanizing creates a metallurgical bond between steel and zinc, forming a coating that will last for generations.  This provides superior strength besides superior coverage, so that galvanized steel structures remain protected, even in their most vulnerable areas. This ensures that the structure is protected from inside out even in case of exposure to extreme corrosive condition, providing complete coverage with the usage of galvanized steel on any structure.

Predictability of Galvanized Steel

Galvanized coating on steel showcases a predictable protection against corrosion weather in a linear fashion. The thicknesses of the coating are measurable and offer life spans that can be relied on and forecasted easily. Using this methodology forecasting for coating thickness based on gauge size of the steel and linear predictability calculating possible of corrosion if any is much easier in galvanized steel, making it ideal for usage and predictable for types of usage.

Triple Protection of Galvanized Steel

The usage of galvanized steel ensures triple protection with its usage in the following ways:

  • Physical Barrier: A galvanized coating provides a physical barrier which is metallurgically bonded, and prevents the underlying steel from being exposed to atmospheric conditions.
  • Sacrificial Protection: A galvanized coating will corrode preferentially and slowly highlighting cathodic protection. It is because scratches on galvanized steel do not require repair work, and in case areas do become exposed to humidity and other corrosive elements, the galvanized coating will corrode preferentially and at a slower rate than the underlying steel.
  • Prevention of sideways creep: In the unusual event that a galvanized coating is locally compromised and bare steel is exposed, the zinc coating will limit damage and prevent a form of corrosion known as sideways creep, which in turn will protect the steel by slowing down the overall corrosion process.

This highlights the triple approach to protection with the usage of galvanized steel. 

Toughness of Galvanized Steel

Galvanizing has an abrasion resistance up to ten times better than organic paint coatings. The hot dip process is unique, producing a coating which is bonded metallurgical to the steel.  As a result, galvanized steel has superior resistance to mechanical damage during handling, storage, transport and erection. This unique metallurgical bonding ensures compact toughness to the galvanizing steel making it in uniquely applicable for all possible requirements.

Faster Turnaround for Galvanized Steel

Galvanizing is not a time-consuming process and in reality, it takes just a few minutes to dip prepared steel work into molten zinc to form a durable, reliable coating. This in turn makes the availability of galvanized steel much faster compared to other metals making it an ideal material for usage since it has a fast turnaround time.

Other than these major benefits that your business can have with the usage of galvanized steel, it also reflects other major advantages as below:

  • Low initial cost
  • Longevity
  • Sacrificial anode
  • Multiple approach to galvanizing process as per requirement

With these additional advantages over the existing benefits highlighted above it is clearly visible how galvanized steel can provide a sustainable solution to a business ensuring it a must requirement in business for greater flexibility and edge over natural agents & calamities and other business competitors.  

If you are looking for galvanized steel requirements in your business, then look no more come to us at galvanizer for best in quality galvanized steel. 

Why Choose Us?

At Galvanizer our team work relentlessly to come up with innovation’s that can deliver you ultimate experience of galvanized products. Our multi-lateral testing and development process ensures delivering our client premiere quality of galvanizing process. With decades of industry experience we offer nothing but the best. To know more or to order from us get in touch with us.