Knowledge

15Nov, 2025

15.1. Methods to prevent the formation of white rust are as follows
(1) During storage, galvanized steel pipes must be kept free of condensation and residual heat; (2) Warehouses should maintain proper ventilation, with air humidity maintained betw
15Nov, 2025

15. What is the white rust of galvanized layer? How to prevent and remove it?
When condensation water adheres to the zinc coating surface and interacts with oxygen, carbon dioxide, hydrogen sulfide, sulfur dioxide, chemical compounds, soot particles, dust, a
12Nov, 2025

14.3. What is electrochemical corrosion?
Electrochemical corrosion refers to the corrosion that occurs when metals interact with electrolytes through electrochemical reactions. During this process, an electric current is
11Nov, 2025

14.2. What is chemical corrosion?
Corrosion caused by the direct chemical reaction between metal and surrounding medium is called chemical corrosion. For example, iron and oxygen in the air react to form rust, whic
11Nov, 2025

14.1. What is metal corrosion?
Metal corrosion refers to the degradation of metals caused by chemical or electrochemical reactions with their surrounding environment. Rust formation represents the most common ma
07Nov, 2025

14. What are the corrosion phenomena of hot-dip galvanizing?
Including but not limited to metal corrosion, chemical corrosion, electrochemical corrosion, etc.
07Nov, 2025

13. What is zinc nickel alloy? What role does it play in hot-dip galvanizing?
Zinc-nickel alloy is an alloy material formed by mixing zinc and nickel in specific proportions. The application of zinc-nickel alloy offers the following benefits for hot-dip galv
05Nov, 2025

12. What is zinc-aluminum alloy block? Why is it used in hot-dip galvanizing?
Zinc-aluminum alloy is formed by casting thin blocks through the eutectic fusion of pure zinc and pure aluminum. In hot-dip galvanizing production, where the zinc bath temperature
05Nov, 2025

11. What is potassium dichromate and sodium dichromate?
Potassium dichromate (K₂Cr₂O₇), commonly known as potassium red alum, is an orange-red monoclinic or needle-like crystal. It has a melting point of 398°C and a boiling point of
03Nov, 2025

10. What is chromium anhydride and chromic acid?
Chromium(III) oxide (CrO₈), also known as chromium trioxide or chromium anhydride, is a reddish-brown crystalline substance. It has a melting point of 197°C and is highly hygro
01Nov, 2025

9. What is ammonium chloride?
Ammonium chloride (abbreviated as Ammonium Chloride) is an inorganic compound with the chemical formula NH4Cl, serving as the ammonium salt of hydrochloric acid and primarily produ
01Nov, 2025

8. What is zinc chloride?
Zinc chloride (ZnCl₂) appears as white powder or granular crystals with a melting point of 283°C and a boiling point of 723°C. It readily absorbs moisture from the air and

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