The biggest advantage of sulphate zinc plating is that the current efficiency is as high as 100%, and the deposition rate is fast. This is unparalleled by other galvanizing processes. Due to the poor crystallization of the coating, poor dispersing power and deep plating ability, it is only suitable for electroplating of pipes and wires with simple geometry. The process of sulphate electroplating zinc alloy is optimized for the traditional sulfate zinc plating process. Only the main salt zinc sulfate is retained, and the remaining components are abandoned. A suitable amount of iron salt is added to the new process formulation to make the original single metal coating form zinc iron alloy coating.
Hot dip galvanized pipe is used for low pressure fluid conveying and mechanical structure for water, sewage, gas, fire fighting, air, oil, heating steam and greenhouse.
1. Uniformity of galvanized coating: steel tube specimens are continuously impregnated in copper sulfate solution for five times and shall not turn red.
2. Surface quality: the surface of galvanized steel tube in Ji'nan galvanized pipe should have a complete galvanized layer. No black spots and bubbles on the surface of the galvanized steel tube are not available, and there are not a lot of rough surface and local zinc tumor.
3, galvanized layer weight: according to demand, galvanized steel pipe can be used as a zinc layer weight measurement, the average value should not less than 500g/ square meters, of which any sample must not be less than 480g/ square meters.
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