발간논문

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Vol.33, No.12, 1609 ~ 1615, 1995
Title
Corrosion Characteristics of AZ91 Mg Alloy in Various Anion Solutions
김경호Kyeong Ho Kim, 김기원Ki Won Kim, 임수근Su Geun Lim, 안효준Hyo Jun Ahn, 허보영Bo Young Hur
Abstract
The corrosion characteristics of AZ91 Mg alloy were studied in various anion-containing solutions. Through weight loss test, changes of corrosion potential under open circuit condition, changes of corrosion current density under potentiostatic condition and optical microscopy, effects of various anions on corrosion behaviours of AZ91 Mg alloy were investgated. It was found that chloride ion had two different effects on corrosion behaviours of AZ91 Mg alloy. When only chloride ions exist in water solution without any other anions, those make pitting corrosion, accelerate more rapidly. But when small amount of chloride ions exist with sulfate or nitrate ions, those make pitting corrosion occur slowly rather than in only sulfate or nitrate ions containing solution. These results were interpreted as competitive adsorption between chloride ion and sulfate or nitrate ion.
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