Canay S, Oktemer M
University of Hacettepe, Faculty of Dentistry, Ankara, Turkey.
Quintessence Int. 1992 Apr;23(4):279-87.
The corrosion behavior of 12 high-gold, low-gold, palladium-silver, and nickel-chromium alloys was tested using electrochemical techniques. A 22-carat-gold alloy was used as a control. High-gold alloys were extremely resistant to corrosion, but the resistance of the alloys decreased with decreasing mobility (from high-gold, to palladium-silver, to low-gold, to nickel-chromium alloys). Tests were also made to determine the type of corrosive attack; nickel-chromium alloys exhibited pitting, and palladium-silver alloys demonstrated the selective dissolution of the silver-rich phases. The corrosion resistance of noble alloys was far superior to that of nickel-chromium-based alloys; therefore, the palladium-silver alloys, which have a moderate price range, may be more suitable for restorations.
采用电化学技术测试了12种高金、低金、钯银和镍铬合金的腐蚀行为。使用一种22克拉的金合金作为对照。高金合金具有极强的抗腐蚀性，但合金的抗性随着活动性降低而减小（从高金合金到钯银合金，再到低金合金，最后到镍铬合金）。还进行了测试以确定腐蚀侵蚀的类型；镍铬合金表现出点蚀，而钯银合金则显示出富银相的选择性溶解。贵金属合金的耐腐蚀性远优于镍铬基合金；因此，价格适中的钯银合金可能更适合用于修复。
