Corrosion of three experimental AgMn-based casting alloys.
Corrosion of three experimental AgMn-based casting alloys.
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三种实验 AgMn 基铸造合金的腐蚀。
DOI：
10.1016/s0300-5712(99)00020-2
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
Ohno,H
中科院分区：
文献类型：
--
作者：
Kawashima,I;Berzins,DW;Sarkar,NK;Ohno,H
我们的实验室正在评估基于AgMn的合金是否可能用作III型牙科合金的替代品。它们对热处理有反应，硬度值与III型合金相当。本研究的目的是评估其腐蚀characteristics.MethodsThe三个实验的银基合金的以下组成（在%）：（1）63 Ag37 Mn，（2）60 Ag35 Mn5 Au和（3）60 Ag35 Mn5 Pd，进行了测试，在其峰值硬化条件。在磷酸盐缓冲盐水（PBS）溶液中对每种合金进行0.5小时开路电位（OCP）测量后，通过循环伏安法技术在1mVs − 1下在− 1300和+200mV（SCE）范围内生成其电流-电位曲线。在一个单独的测试中，每种合金的OCP监测超过24 h period.ResultsEach的三种合金显示ennoblement他们的OCP随着时间的推移，由于溶解的锰和随之而来的富集与银（Au或Pd）。在24 h时，两种三元合金的惰性最强，其次是二元合金。对于循环伏安法，在0 mV左右的正向扫描期间观察到银的氧化。反向扫描的还原电流峰值在− 37至− 128 mV之间。该峰值是银氧化的量度，二元合金的峰值最高（11.5mAcm − 2），其次是Au-（2.9mAcm − 2）和含Pd（0.04mAcm − 2）合金。这表明，在同等浓度下，Pd在降低Ag腐蚀方面比Au更有效。这里介绍的AgMn基合金的腐蚀特性的信息是有价值的，在进一步开发这种合金系统。
ObjectiveAlloys based on AgMn are being evaluated in our laboratory for their possible use as an alternative to Type III dental alloys. They respond to heat treatment and develop hardness values comparable to that of Type III alloys. The objective of the present research was to evaluate their corrosion characteristics.MethodsThe three experimental silver-based alloys of the following composition (at%): (1) 63Ag37Mn, (2) 60Ag35Mn5Au and (3) 60Ag35Mn5Pd, were tested in their peak-hardened condition. Following 0.5h open-circuit potential (OCP) measurement of each alloy in a phosphated buffer saline (PBS) solution, its current–potential profile was generated by the cyclic voltammetry technique within −1300 and +200mV (SCE) at 1mVs−1. In a separate test, the OCP of each alloy was monitored over a 24h period.ResultsEach of the three alloys showed ennoblement of their OCP over time due to dissolution of Mn and consequent enrichment with Ag (Au or Pd). At 24h, the two ternary alloys were the most noble followed by the binary alloy. With respect to the cyclic voltammetry, oxidation of Ag was noted during forward scans at around 0mV. The reverse scan was associated with a reduction current peak between −37 and −128mV. The values for this peak, which is a measure of Ag oxidation, were highest (11.5mAcm−2) for the binary alloy followed by the Au- (2.9mAcm−2) and Pd-containing (0.04mAcm−2) alloys, respectively. This indicates that, for equivalent concentration, Pd is more effective in reducing Ag corrosion than Au.SignificanceAlloys based on the AgMn system are as hard as Type III dental alloys. Information on the corrosion characteristics of the AgMn-based alloys presented here is of value in further development of this alloy system.
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DOI：
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