Researching On The Reaction Mechanism Of Common Corrosion Resistant Zinc Coating Base Metal Material In Liquid Zinc

In industrial production, hot dip galvanizing process becomes one of the most effectiveand essential methods to prevent corrosion of the steel products in nature. Because when steelcomponents after dealing with the hot-dip galvanizing technology can be in the air, water andsoil as well as a variety of long-term corrosion medium, maintained excellent corrosionresistance. Therefore, the hot-dip galvanizing technology has been widely used in all areas ofdaily life, account for a large proportion in the national economy. Per capita consumption ofgalvanized products and even to some extent, marks a country’s standard of living, but ofgalvanized metal products rate is still less than14%in our country, far behind the developedcountries. Resulting in slow galvanizing industry in China is mainly due to corrosion causedby the short life of molten zinc galvanizing equipment, high costs, low productivity problem.By thermal spraying methods can effectively prevent sinking roll galvanizing equipment fromcorrosion, so looking for zinc corrosion-resistant material is particularly important.This artical studies the common corrosion resistant zinc coating base metal material andreaction mechanism of liquid zinc by plasma spraying method with molybdenum powder,nickel powder, tungsten powder, making the metal cotaing, but also as a metal coating madeof iron comparative experimental material, the four kinks of coating to do the analysis andmicrohardness measured porosity, wherein the porosity of the nickel coating is minimum at3.13%, the coating microstructure of tungsten hardness is maximum at452HV; then, fourkinds of liquid zinc coating reaction, respectively using optical microscopy corrosion ratemeasured within48h with four kinds of liquid zinc corrosion coating, which the average rateof iron coating corrosion is1μm/h, the average rate of corrosion of molybdenum coating is0.1μm/h, nickel coating the average corrosion rate of0.19μm/h, the average rate of tungstencorrosion coatings for0.075μm/h; Using the scanning electron microscopy in four coatingswere subjected to corrosion morphology after24h and48h; Using spectrum analyzer analysisof the four kinds of coatings by liquid zinc corrosion around24h and48h after coating andinternal distribution of elements, understand the characteristics of the zinc reaction solutionwith four kinds of metals; Using the X-ray spectrum analyzer to analysis four kinds ofcoating in zinc liquid corrosion24h and48h after the reaction products; through the above analysis, concluded that the four kinds of liquid zinc coating corrosion mechanism, in whichthe iron coating as a contrast liquid coating most vulnerable to corrosion of zinc,molybdenum coating and nickel coating etching process exhibit good corrosion resistance,the corrosion rate is slow, the reaction products were less. The reaction did not occur withtungsten coating liquid zinc in the corrosion process, but a small amount of liquid zinccoating intrude into the interior of the tungsten coating causing cavitation and corrosioncracking, peeling occurs tungsten coating.