Development of a new type of helplessness plating agent and zinc pot smoke reduction methods

At present, there is a relatively economical solution to the smog generated in the process of hot dip galvanizing, which is to collect the wet zinc smog, remove the dust and acid through dust removal and water spraying. More than 75%-95% smoke and dust can be extracted and removed to improve the operation environment of hot galvanizing. The technical programme in this area has been described in detail. According to the concept of "specimens of collaborative governance", fundamentally solve the ammonium oxidation under the condition of high temperature decomposition to produce white smoke is one of the important aspects, some domestic research institutes and universities of science and technology have noticed this problem, the start is committed to research and develop without ammonium plating aid, the purpose is to replace the current mixed plating aid by zinc chloride and ammonium chloride: development without ammonium chloride and plating aid has become the trend of development, and has a great application prospect of market. It is understood that there are not many achievements in the research and application of ammonium chloride assistant plating process so far, and the related reports are only in the experimental state. Among them, a us patent USP38604381131 and a Chinese patent CN135640A proposed to use salty metal fluoride and fluorosilicate hydrochloric acid as the main plating aid with fluoride added, indicating that it is used to prepare aluminum alloy coatings in zinc aluminum alloy liquids with at least 25% and 5% aluminum content. However, the above method also has the disadvantages of ammonium chloride decomposition and volatilization harmful substances, high cost of raw materials, easy chlorination and foul plating during galvanization, which has certain toxicity and pollutes the environment. None of the above results have been reported in industrial application.

In order to solve the steel hot dip galvanizing of white smoke, technical problems on the basis of the test we developed not containing ammonium chloride plating assistant white smoke, can be improved to reduce steel hot dip yes smoke, its formulation components to adapt to the batch steel after hot base salary to optimize industrial processes, the formula is simple and has low production cost, help help plated on stable quality and adapt to the batch of steel bearings, etc. The key points of the preparation are: chlorination is still the main component of the plating solvent, so the ammonium chloride should be removed and replaced with rare earth chloride, small amount of modified rhodium and plating aid additive, and the rest should be water.