INFLUENCE OF Si02 AND AI2O3 TO CORROSION RESISTANCE OF ZNNI COATINGS IN NATURAL ATMOSPHERE AND ARTIFICIAL ATMOSPHERE
Nguyễn Huy Dũng
Abstract
Electrodeposited zinc-nickel alloy coatings (with composition of Ni: 0, 7 and 14% by weight) in ammonic bath have experimented in natural atmospheres and artificial atmospheres (salt-fog test). Results in salt-fog test show that corrosion resistance of ZnNi coatings is higher by far than Zn coating, especially ZnNi 14% coating. But, results in natural test are on the contrary. Coating composition with Si02 and AI2O3 inert particles has effect on improve significantly corrosion resistance of these electrodeposited alloy coatings. Results are affirmed by tests in natural atmospheres and artificial atmospheres (salt-fog test).