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Aluminum alloys with a high Mg content (above 4.5%) have high strength, but are more sensitive to corrosion than alloys with a low Mg content. To protect aluminum alloys, conversion coatings obtained by chemical oxidation can be used. It was previously shown that the alkaline chromate-free converting composition of IFKHANAL-3 makes it possible to obtain conversion coatings with high protective properties on the surface of the alloy. In this work, modifications of chromate-free inhibited conversion coatings IFKHANAL-3 were investigated in order to obtain coatings with high protective properties on aluminum alloys AMg5 and AMg6. The effectiveness of the coatings obtained was evaluated based on the results of corrosion and electrochemical tests. Modifying additives were used to enhance the protective effect.
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Chugunov et al. (2024) studied this question.
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