Wire flexibility and elongation is good, can withstand the pressure of mechanical operation, in our country’s industry has played a very important role. There are many kinds of iron wire. The most common ones are black iron wire and galvanized iron wire. The corrosion resistance of the outer coating has been effectively improved, but the phenomenon of crevice corrosion will be found after long-term use.
Crevice corrosion is a kind of corrosion in small area, especially in concealed position, which can form vicious corrosion cycle. Almost all the crevice corrosion can occur in a metal alloy, with gas containing active anionic neutral medium Z is easy to cause crevice corrosion, crevice corrosion often occurs in the aperture of 0.025 to 0.1 mm, because of long time gathered, the cracks will exist a series of impurities, coupled with the external environment of damp easily corrode the area of the gap is small.
Long-term exposure to such impurities will result in transition and gap corrosion. The direct solution to this phenomenon is to strengthen the coating of the material to avoid corrosion. The duration of protection of galvanized iron wire is greatly related to the thickness of the coating. Generally speaking, in the relatively dry main gas and indoor use, and in harsh environmental conditions, galvanized layer thickness needs to be very high. Therefore, in the selection of galvanized layer thickness to consider the impact of the environment.
After the passivation treatment of galvanized layer, a bright and beautiful color passivation film can be generated, which can significantly improve its protection performance and fastening performance. There are many kinds of zinc plating solutions, which can be divided into cyanide plating solution and cyanide free plating solution according to their properties. Cyanide zinc plating solution has good dispersing ability and covering ability, the coating crystallization is smooth and meticulous, the operation is simple, the application range is wide, and it has been used in production for a long time. However, as the plating solution contains highly toxic cyanide, the gas escaping in the plating process is harmful to workers’ health, so the wastewater must be treated strictly before discharge.
Post time: 06-04-22