Heat treatment effects on electrochemical corrosion parameters of high-Pd alloys.
Heat treatment effects on electrochemical corrosion parameters of high-Pd alloys.
复制标题
热处理对高Pd合金电化学腐蚀参数的影响。
DOI：
10.1007/s10856-006-0054-5
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
Sarkar,NK
中科院分区：
文献类型：
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作者：
Berzins,DW;Kawashima,I;Graves,R;Sarkar,NK
这项研究确定了在瓷器烧制过程中发生的氧化对Pd基瓷合金的腐蚀参数的影响，以及它与Pd过敏的关系。测定了11种工业Pd合金在磷酸盐缓冲溶液中的20h开路电位(OCP)、20h腐蚀速率(Icorr)和阳极极化(E-I)曲线。根据成分将合金分为以下四组：PdGa(Ag)、PdCu、PdAg和AuPd，并在铸态和氧化条件下进行测试。在铸态和氧化条件下，含银Pd合金的OCP均显著低于不含银的高钯合金。氧化后所有合金的OCP均增大。在腐蚀速率方面，含银合金的Icorr随氧化程度的增加而降低。相比之下，四种不含银的高Pd(≥74wt%)合金中有三种表现出较高的Icorr。阳极极化曲线的比较表明，只有含银量较大(≥16wt%)的合金才显示出铸态和氧化态的显著差异。在烤瓷金属器件制备过程中所需的氧化改变了所研究的合金的电化学特性。这一变化可能是重要的，因为他们的潜在PD过敏。
This research determined the effect oxidation, as that occurs during porcelain firing, has upon the corrosion parameters of Pd-based ceramic alloys and how it may relate to Pd allergy. The 20 h open circuit potential (OCP), 20 h corrosion rate (Icorr), and anodic polarization (E–i) curves of 11 commercial Pd alloys were measured in a phosphate buffered saline solution. The alloys were divided into the following four groups based upon composition: PdGa(Ag), PdCu, PdAg, and AuPd and tested in both as-cast and oxidized conditions. In both the as-cast and oxidized conditions, the OCP of Ag-containing Pd alloys is significantly lower than non Ag-containing high-Pd alloys. The OCP of all alloys increased after oxidation. With regard to corrosion rate, the Ag-containing alloys showed a decrease in Icorr with oxidation. In contrast, three of the four non Ag-containing high-Pd (≥74 wt%) alloys exhibited a higher Icorr. A comparison of the anodic polarization curves showed only the alloys containing larger amounts (≥16 wt%) of Ag displayed a notable difference between as-cast and oxidized states. Oxidation as required during porcelain-fused-to-metal device preparation alters the electrochemical characteristics of the alloys studied. This alteration may be of importance with regard to their potential for Pd allergy.