China Zinc-aluminum-magnesium Alloy Coated Steel

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China zinc aluminum magnesium coated steel has better corrosion resistance

Some data show that when the pH value of the galvanized surface is in the range of 5-13.5, a corrosion product film will form on the surface of the coating. Under different pH values, the chemical composition and morphology of the corrosion products will be different. The density, conductivity, adhesion, hardness, resistance to dissolution, and decomposition of corrosion products will affect the progress of the corrosion reaction.

The corrosion products of zinc-aluminum-magnesium coatings are denser, have lower conductivity, higher adhesion, and higher resistance to dissolution and decomposition than galvanized corrosion products, and therefore have higher corrosion resistance.

(1) The role of Mg and Al:

1. Mg and Al in zinc-aluminum-magnesium coating can stabilize basic zinc carbonate and prevent the formation of loose ZnO. It will promote the development of oxide corrosion products toward density, low solubility, and poor conductivity.

2. When the AL content is high, dense precipitate corrosion products with good adhesion and low conductivity will be generated;

3. The polarization resistance of Zn-Al-Mg alloy coating is about twice that of pure zinc coating, which is one of the reasons why the corrosion resistance of Zn-Al-Mg alloy coating is higher than that of pure zinc coating.

(2) Stainless steel refers to steel that is resistant to corrosion by weakly corrosive media such as air, steam, and water and chemically corrosive media such as acids, alkali, and salts. It is also called stainless acid-resistant steel. In practical applications, steel that is resistant to corrosion by weakly corrosive media is often called stainless steel, while steel that is resistant to corrosion by chemical media is called acid-resistant steel. Due to the difference in chemical composition between the two, the former is not necessarily resistant to corrosion by chemical media, while the latter is generally stainless. The corrosion resistance of stainless steel depends on the alloying elements contained in the steel.

According to the classical acid-base theory and Lewis acid-base theory, there are two main types of acids.

The first category, the classic acid-base theory, believes that substances that can provide hydrogen protons are called acids (Brønsted acid), also called protic acids, such as sulfuric acid (H2SO4) hydrochloric acid (HCl), etc.

There are many ways to classify, such as organic acids and inorganic acids according to the characteristics of the substance; the number of protons that the substance can provide: monobasic acid, dibasic acid, tribasic acid, polybasic acid, etc.; according to the acidity of the substance Divided into: strong acid, weak acid

The second category, Lewis acid-base theory, believes that substances that can accept one electron pair are called acids (Lewis acids), such as cerium trichloride, ferric chloride, magnesium chloride, etc. Generally not classified...

The zinc, aluminum, and magnesium contained in the coating alloy react rapidly when in contact with commonly known hydrochloric acid and sulfuric acid, so the coating products cannot be used in direct contact with such acids.

The acid resistance of coating products generally refers to their application in acidic atmospheric environments (such as some industrial atmospheres) and acidic aqueous solutions (such as acid rain, and disinfectants).

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