Knowledge

18Mar, 2026

86. What impact does pre-treatment have on the adhesion of the galvanized layer?
When the pre-treatment employs the "solvent (melting) method", the steel pipe surface may develop various issues: residual iron oxide scale from insufficient acid washing
18Mar, 2026

85. What is the effect of molten zinc temperature on zinc slag? At what iron ...
When molten zinc reaches high temperatures, significant amounts of iron dissolve into it. For instance, at 510°C, 0.10% of iron dissolves, forming zinc slag that constitutes 1.
16Mar, 2026

84. How does zinc slag affect the galvanized coating of galvanized steel pipes?
During hot-dip galvanizing, zinc slag from the molten zinc mixture becomes embedded in the zinc layer. When steel pipes are coated, these slag particles remain trapped within the z
16Mar, 2026

83. How is zinc slag formed? What are its components?
Zinc slag is primarily the product of zinc-iron reactions, consisting mainly of an iron-zinc alloy layer formed through the combination of zinc and iron. Consequently, zinc slag ty
16Mar, 2026

82. What is zinc slag?
When the steel rod is inserted into the bottom of the galvanized pot, a layer of condensed sandy material is observed beneath. If these materials are removed using a dregs skimmer,
11Mar, 2026

81. What are the hazards of zinc ash to hot-dip galvanizing?
As analyzed in the zinc ash composition section, zinc ash contains not only the primary component zinc oxide but also other oxides such as aluminum oxide, antimony oxide, chlorides
10Mar, 2026

80. What are the advantages and disadvantages of frequent zinc ash scraping?
During hot-dip galvanizing, the zinc ash layer (primarily zinc oxide) on the molten zinc surface thickens progressively. Failure to remove this residue results in black spots from
09Mar, 2026

79. Why does the zinc ash content at the tail end of the steel pipe's zinc ba...
In hot-dip galvanizing production, operators must meticulously scrape off zinc ash from the molten zinc surface at the pipe's tail end. During the process, steel pipes are firs
04Mar, 2026

78. What methods can be used to reduce the production of zinc ash?
The factors that accelerate the formation of zinc ash have been identified, and thus methods to reduce zinc ash can be developed accordingly. (1) Add a specific amount of aluminum
03Mar, 2026

77. Why are galvanized steel pipes typically free of zinc flowers, whereas ga...
As is well known, galvanized steel pipes typically lack visible zinc flowers. This occurs because the pipe surface is inherently rough and uneven. When the pure zinc layer is immer
02Mar, 2026

76. Why is zinc ingot always added directly from both ends of the galvanizing...
The hot-dip galvanizing method using direct zinc ingot feeding involves placing 23-25 kg zinc ingots at both ends of the galvanizing pot. Since furnaces with bottom or side heating
27Feb, 2026

75. Why do thin-walled pipes and thick-walled pipes exhibit different zinc pa...
Under identical hot-dip galvanizing conditions and cooling parameters, thin-walled pipes and thick-walled pipes exhibit distinct zinc flower patterns after galvanizing. The former

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