CORROSION OF CHROMATE CONVERSION COATINGS ON ALUMINUM ALLOYS IN ELECTRICAL AND ELECTRONIC EQUIPMENT

Chromate conversion coating is applied on aluminum ۶۰۶۱. The optimum conditions for chromate bath composition and immersion time are also obtained for standard requirements provision such as corrosion resistance in salt spray test, electrical resistance and coating quality. The applied coatings are electrochemically tested in sea and distilled water. According to Tafel and cyclic polarization curves, the protection mechanism are evaluated in said environments. This evaluation has shown the formation of passive film layer, contains chromate and alumina on the base. The proper behavior of corrosion and electrical conductivity is probably due to this mechanism.

کلیدواژه ها:

Corrosion ، Chromate coating ، Aluminum and Electrical and electronic equipment ، خوردگی ، پوشش کروماته ، ‎آلومینیم و تجهیزات الکتریکی و الکترونیکی