Large rolls of galvanized wire often turn black, affecting its beauty, in the process of galvanizing, how to effectively avoid and prevent this problem?
In fact, in the galvanizing process, we should pay attention to the air, the impurities of the production of steel plates and the health of the construction personnel, in fact, these are all problems that will affect the galvanized wire. Some simple treatment methods can prevent the galvanized wire from blackening or extending the blackening time during the production process, such as: keep the work site dry, reduce and do not use chemicals, and the operator with clean gloves.
In addition, manufacturers can be asked to be passivated after zinc immersion, after passivating zinc has a better anti-discoloration effect, can effectively extend the time of discoloration, the combination of the two, discoloration should be able to solve. Stress relief before plating Where the tensile strength is greater than 1034Mpa, important parts should be relieved at 200±10℃ for more than 1 hour before plating, carburizing or surface hardening parts should be relieved at 140±10℃ for more than 5 hours.
Hot-dip galvanized wire is a variety of medium or high carbon steel through pickling, phosphating, wire drawing, and then galvanized; Hot dip galvanizing is dipped in the zinc liquid melted by heating, the production speed is fast, the coating is thick but not uniform, the thickness allowed by the market is 45 microns, and the height can reach more than 300 microns. The color is dark, the consumption of zinc metal is more, the infiltration layer is formed with the base metal, the corrosion resistance is good, and the hot dip galvanizing can be maintained for decades in the outdoor environment.
Post time: 06-11-23