Knowledge

04Dec, 2025

26. What is the corrosion condition of zinc coating in oil field?
With the development of China's petroleum industry, the use of galvanized steel pipes for crude oil transportation in oil fields has become increasingly widespread. Consequentl
04Dec, 2025

25. How does the zinc coating corrode on buildings?
The corrosion of zinc coatings on buildings is determined by the properties of construction materials. For example, cement and lime slurry exhibit high alkalinity, which significan
28Nov, 2025

24. How does the zinc coating corrode in the soil?
In certain soils, zinc coatings form a protective zinc carbonate layer that provides anodic protection for steel pipe substrates. However, the effectiveness of this protection vari
28Nov, 2025

23. How does the zinc coating corrode in seawater?
Seawater typically contains 1-25% salt content, with 3.5% being the standard reference. The water contains significant amounts of oxygen, nitrogen, and carbon dioxide, which accele
26Nov, 2025

22. How does the zinc coating corrode in distilled water?
The corrosion of zinc coating in distilled water is not small, which is second only to rain water and slightly higher than soft water. The corrosion rate of zinc coating in distill
26Nov, 2025

21. How does the zinc coating corrode in hot water?
Zinc-coated steel pipes are used not only for water supply but also for transporting hot water, boiling water, and steam. The corrosive effects of these media differ from those of
24Nov, 2025

20. How does the zinc coating corrode in cold tap water?
Water-gas galvanized steel pipes (referred to as "Galvanized Welded Steel Pipes for Low-Pressure Fluid Transportation" in the new national standard GB3091-82) are primari
21Nov, 2025

19. Why does zinc coating corrode faster in sulfur containing industrial air?
In industrial cities with high concentrations of flue gas, the air contains substantial amounts of sulfur dioxide and solid particles, including 30% insoluble residues, 33% charred
21Nov, 2025

18. What are the causes of zinc coating corrosion in indoor environments? Wha...
Zinc coating corrosion indoors is significantly less severe than outdoors due to the absence of rainwater erosion, typically reducing corrosion by about 80%. The primary indoor cor
19Nov, 2025

17. What are the causes of corrosion of zinc coating in outdoor? What are the...
The corrosion of zinc coatings outdoors primarily depends on air quality, humidity, and rainfall. Outdoor air can be categorized as follows: (1) Rural air in clean environments is
19Nov, 2025

16. What is the difference between the corrosion of zinc layer in acid-free a...
The corrosion behavior of zinc coatings differs significantly between acidic and alkaline environments. Generally, in non-acidic or non-alkaline conditions, zinc oxide (ZnO) forms
19Nov, 2025

15.2. Methods to remove white rust
(1) If the "white rust" appears white, first wash it off in water, then dry the zinc layer with a cloth. Apply a paste made by mixing talcum powder and sodium hydroxide w

First 3 4 5 6 7 8 9 Last 6/111