CERIUM CONVERSION COATINGS FOR THE CORROSION PROTECTION OF ALUMINIUM.

被引：0

作者：

Hinton, B.R.W. ^{[1
]}

Arnott, D.R. ^{[1
]}

Ryan, N.E. ^{[1
]}

机构：

[1] Aeronautical Research Lab, Melbourne, Aust, Aeronautical Research Lab, Melbourne, Aust

来源：

Materials Forum | 1986年 / 9卷 / 03期

关键词：

ALUMINUM AND ALLOYS - Protective Coatings - ALUMINUM CASTINGS - Protective Coatings - ALUMINUM COPPER ALLOYS - Protective Coatings - CERIUM COMPOUNDS - SURFACES - Microanalysis;

D O I：

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摘要：

Cerium-rich coatings formed on aluminum alloys by (a) open circuit exposure to cerous chloride solution, (b) cathodic treatment in aqueous cerous chloride solution, or (c) cathodic treatment in cerous nitrate dissolved in butoxyethanol all provided corrosion protection in aqueous NaCl when assessed using an electrochemical technique. The surface morphologies and compositions of the coatings were complex and varied depending on the treatments used. They were based on films of cerium oxide/hydroxide or mixtures of cerium oxide/hydroxide and aluminum oxide. The variation in morphology and composition was reflected in the durability and degree of corrosion protection achieved with the coatings. The coatings produced under open-circuit conditions provided the best combination of durability and protection; however, these required long application times. Corrosion protection was achieved through suppression of the oxygen reduction reaction at cathodic sites on the metal surface. In addition, some coatings were capable of preventing pitting. The main alloy chosen for study was 7075-T651 aluminum alloy plate (Al-5. 6% Zn-2. 5%Mg-1. 6%Cu-0. 3%Cr). Limited data were also obtained with as-cast Al-1. 8%Cu alloy and as-cast 99. 99% pure aluminum.

引用

页码：162 / 173