Knowledge

09Feb, 2026

74. Why is the product quality of dry-process hot-dip galvanizing better than...
In dry hot-dip galvanizing, adding aluminum to the zinc bath improves the structure and thickness of the iron-zinc alloy layer, resulting in a bright pure zinc coating with excelle
06Feb, 2026

73. Why is there more leakage in the interior and exterior of galvanized stee...
Steel pipes are galvanized components with a significant length-to-diameter ratio. The inner walls require zinc plating under far harsher conditions than the outer surfaces. During
06Feb, 2026

72. Why is aluminum prohibited in the zinc bath of hot-dip galvanizing?
In conventional "wet" hot-dip galvanizing processes, aluminum is typically excluded from the zinc bath. When aluminum is introduced, its higher density causes it to float
06Feb, 2026

71. Why do missed coating spots and zinc particles frequently occur during al...
This paper does not discuss the leaching spots caused by pickling, solvent and drying, but only discusses the causes of leaching spots in hot-dip galvanizing. (1) The aluminum in t
03Feb, 2026

70. What methods can be used to reduce the generation of zinc ash?
(1) Add aluminum appropriately in the galvanized pot; (2) Reduce the contact area between the molten zinc surface and air by using a small-diameter galvanized pot; (3) Lower the mo
03Feb, 2026

69. What are the factors affecting the growth rate of zinc ash?
Zinc ash is an oxide of zinc formed through oxidation when zinc liquid comes into contact with air. This layer of zinc ash initially forms, isolating the underlying liquid zinc fro
30Jan, 2026

68. How does the quality of zinc-aluminum alloy affect the galvanized coating?
The quality of zinc-aluminum alloy is very important. If the quality is not good, the surface of the galvanized layer will appear rough zinc particle defects after adding zinc liqu
30Jan, 2026

67. What are the advantages and disadvantages of adding lead to zinc liquid?
67. What are the advantages and disadvantages of adding lead to zinc liquid? (1) The benefits of adding lead to zinc liquid include reducing melting time, minimizing corrosion of g
30Jan, 2026

66. Why should steel pipes be tilted at an angle when dipping into molten zin...
When steel pipes are immersed in molten zinc for galvanizing, they must be tilted at an adequate angle, especially for small-diameter pipes where the central sagging and bending ar
30Jan, 2026

65. Under what conditions is zinc slag produced? What are its components and ...
Zinc slag primarily consists of the reaction products between zinc and iron, with its main component being the ζ-phase iron-zinc alloy layer formed through their combination.
30Jan, 2026

64. How is zinc ash formed? What are its components?
Zinc ash, or zinc oxide, forms rapidly during hot-dip galvanizing, typically appearing immediately after each coating pass. This occurs because zinc liquid reacts with atmospheric
23Jan, 2026

63. How does nickel content in steel pipes and galvanized pot substrates affe...
Nickel (Ni), a gray metal with a cubic or hexagonal crystal structure, has a relative atomic mass of 58.69, melting point of 1455°C, and boiling point of approximately 2340°

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