Watanabe I, Hai K, Tanaka Y, Hisatsune K, Atsuta M
Department of Fixed Prosthodontics, Nagasaki University, School of Dentistry, Nagasaki, Japan.
Dent Mater. 2001 May;17(3):217-20. doi: 10.1016/s0109-5641(00)00072-5.
The objective of this study was to investigate the corrosion resistance of cast Fe-Pt alloys of varying compositions for use as attachment keepers and to make a comparison with the corrosion resistance of magnetic stainless steel.
The corrosion behavior of cast Fe-Pt alloy keepers (Fe-40 at%Pt, Fe-38 at%Pt, Fe-37 at%Pt and Fe-36 at%Pt) was evaluated by means of an immersion test and an anodic polarization test. The solutions used were a 1.0% lactic acid aqueous solution (pH=2.3) (10 ml) and 0.9% NaCl solution (pH=7.3) (10 ml). As a control, the corrosion resistance of a magnetic stainless steel keeper (SUS 447J1: HICOREX) was also measured.
Chromium and platinum ions were not detected in either the 1.0% lactic acid or 0.9% NaCl solutions. The only released ions detected were the Fe ions in the 1.0% lactic acid solution. The amounts of Fe ions released from the Fe-40 at%Pt and Fe-38 at%Pt alloys were significantly (p<0.05) lower than from the Fe-37at%Pt, Fe-36 at%Pt and SUS 447J1 alloys. In the anodic polarization test, the potentials at the beginning of passivation for the four Fe-Pt alloys were higher than for the SUS 447J1 alloy in both solutions.
The Fe-Pt alloys, especially the alloys with higher Pt percentages (Fe-40 and 38 at%Pt), indicated a high corrosion resistance compared to the magnetic stainless steel keeper. A reduction in the Pt percentage may decrease the corrosion resistance in the oral environment.
本研究的目的是调查不同成分的铸造铁铂合金作为附着保持器的耐腐蚀性，并与磁性不锈钢的耐腐蚀性进行比较。
通过浸泡试验和阳极极化试验评估铸造铁铂合金保持器（Fe-40原子百分比Pt、Fe-38原子百分比Pt、Fe-37原子百分比Pt和Fe-36原子百分比Pt）的腐蚀行为。使用的溶液为1.0%乳酸水溶液（pH=2.3）（10毫升）和0.9%氯化钠溶液（pH=7.3）（10毫升）。作为对照，还测量了磁性不锈钢保持器（SUS 447J1：HICOREX）的耐腐蚀性。
在1.0%乳酸或0.9%氯化钠溶液中均未检测到铬和铂离子。唯一检测到的释放离子是1.0%乳酸溶液中的铁离子。从Fe-40原子百分比Pt和Fe-38原子百分比Pt合金中释放的铁离子量显著（p<0.05）低于从Fe-37原子百分比Pt、Fe-36原子百分比Pt和SUS 447J1合金中释放的量。在阳极极化试验中，在两种溶液中，四种铁铂合金的钝化开始时的电位均高于SUS 447J1合金。
与磁性不锈钢保持器相比，铁铂合金，尤其是铂含量较高的合金（Fe-40和38原子百分比Pt）显示出高耐腐蚀性。铂百分比的降低可能会降低在口腔环境中的耐腐蚀性。
