Contents
1. What is galvanized steel coil?
2. Related to the electric current produced by a chemical reaction
3.Will galvanized steel coils rust?
6.Sequins
When something prompts us to take action, we say that we are "inspired". So, when we use the term galvanized steel or metal, what does it mean? It turns out that all of this is related to shock. Ferrous metals contain iron, which accounts for 90% of the world's metal manufacturing industry. Iron is dense, strong (when mixed with carbon to become steel), abundant, and easy to refine. These characteristics make galvanized steel coil the most important metal in industry and construction. However, iron and many of its alloys are also very susceptible to rust when exposed to air and water. Preventing corrosion is part of the design of ferrous metals. Sometimes, the oxidation protective layer for galvanized steel coil may come from the type of alloy. For example, stainless steel contains chromium and other elements to prevent corrosion. However, the galvanizing method of galvanized steel coils can change the mechanical properties. They can also be expensive. Sometimes, sealants such as powder coatings, paints or oil treatments are used. Galvanized steel is more common, but people know less about it. How do you make galvanized steel coils? Will galvanized steel coils rust?
What is galvanized steel coil?
The galvanizing method of galvanized steel coil is a process of applying a zinc coating on steel or iron to form an oxidation protective layer for galvanized steel coils. The zinc layer acts physically by preventing water and air from reaching the steel surface, and acts chemically by providing cathodic protection. This kind of protection is electrochemical, just like the metaphorical "plating", and it motivates us to take action.
Related to the electric current produced by a chemical reaction
Galvanizing is usually carried out at high temperatures. Although the zinc layer can be added by painting or electroplating, the galvanizing method of galvanized steel coil in either of these two methods can only form a thin layer-only a shiny surface with a thickness of 3 microns. Local applications like this are fragile in outdoor applications where corrosion resistance is important. True galvanizing occurs at high temperatures and relies on the chemical interaction between zinc, oxygen and carbon dioxide. The three react under temperature to form an oxidation protective layer for galvanized steel coils. The thickness is usually 50 microns, which is more durable in outdoor environments.
Will galvanized steel coils rust?
You might ask yourself, "Will galvanized steel coils rust?" The answer is yes, to a certain extent, and based on conditions. The degree of rusting of galvanized steel depends on the thickness of the protective zinc coating and the type of corrosive environment. Under what conditions will galvanized steel coils rust? The most common ones include high humidity, humid or immersion environment, salt in air or water, moss and acid. However, the galvanizing method of galvanized steel coils also provides good resistance to contact with concrete, mortar, lead, tin, zinc and aluminum. Galvanizing helps to extend the time to prevent rust. It relies on the oxidation of zinc to prevent the oxidation of steel or iron. Under proper conditions, galvanized steel coils can prevent rust for up to 50 years. Rusting or oxidation of galvanized steel coils stops. However, oxidation still occurs in the zinc (but this is not called rust.) When the zinc is finally completely converted by oxidation, the oxidation protective layer for galvanized steel coils will no longer have a protective effect and the steel will be chewed.
Hot dip galvanized
Hot-dip galvanizing is the most common galvanizing method for galvanized steel coils. In this method, steel or iron parts are cleaned of debris and scale, and then placed in a zinc or zinc alloy bath at a temperature close to 840°F. The steel stays in the molten pool until it reaches the same temperature, then it is lifted and cooled. This cooling can be done quickly or slowly, depending on the expected appearance of the final galvanized steel coil. Galvanizing annealing is a process of galvanizing in a zinc bath to which aluminum is added. When the metal is still hot, the entire product undergoes heat treatment, resulting in the formation of several layers of zinc-iron alloy. The addition of aluminum and subsequent heat treatment make the resulting steel have better weldability. The oxidation protection layer of galvanized steel coils usually produces red rust-like patina, but it will not corrode like unprotected iron alloys.
Dry galvanized
A less common method of galvanizing galvanized steel coils is dry galvanizing. In this technique, small steel parts are heated with zinc powder and sand in a closed rotating drum until the temperature and tumbling cause the zinc to chemically fuse to the steel surface. Then the galvanized steel coil is quenched. It is usually used for small parts and parts with inner surfaces that may not be reached by hot dipping.
Sequins
One of the traditionally recognizable characteristics of the galvanizing method of galvanized steel coils is the sequins on the surface. All metals freeze in crystalline form, like a series of closely packed snowflakes. For most metals, the grains are too small to be seen, or the grain boundaries are not obvious if they are not etched. Galvanized steel coil allows one to see the crystallization patterns formed during the freezing of metals. The shape and size of the galvanized flower can indicate the cooling conditions after hot-dip galvanizing. The slower the surface freezes, the larger the crystal grains, which are usually feather-like or leaf-like. Quick quenching to a cooler temperature will result in smaller, more regular or more square grains. Many of the most eye-catching sequins are usually made from small amounts of lead or tin in zinc alloys. These additives allow the production of dendritic-like grains-the freezing process encourages feather-like shapes to stretch on the surface. The development of lead-free galvanized steel coils produced a zinc coating that freezes from the steel. The oxidation protective layer for galvanized steel coils may produce round sequins with a diameter of less than 0.5 mm. The interaction between alloys and freezing conditions means that skilled galvanizers can influence the size and shape of the sequins in the final product.
Siyoute specializes in providing galvanized steel coils manufactured by various galvanizing processes. If you want to know more about "will galvanized steel coils rust?", please continue to pay attention to the official website of siyoute. We will update related products from time to time and provide related product information and materials. We look forward to your visit and consultation.
Tags: Will galvanized steel coils rust, oxidation protective layer for galvanized steel coils, the galvanizing method of galvanized steel coil
