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Effect of the coexistence of albumin and H2O2 on the corrosion of biomedical cobalt alloys in physiological saline

机译：白蛋白和H2O2的共存对生理盐水中生物医学钴合金腐蚀的影响

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The corrosion of Co–28Cr–6Mo and Co–35Ni–20Cr–10Mo, as biomedical alloys, has been investigated for effects of typical species (albumin and H _(2) O _(2) ) in physiological saline, with their coexistence explored for the first time. Electrochemical and long term immersion tests were carried out. It was found that Co alloys were not sensitive to the presence of albumin alone, which slightly promoted anodic dissolution of Co–35Ni–20Cr–10Mo without noticeably affecting Co–28Cr–6Mo and facilitated oxide film dissolution on both alloys. H _(2) O _(2) led to a clear drop in corrosion resistance, favouring metal release and surface oxide formation and inducing much thicker but less compact oxide films for both alloys. The coexistence of both species resulted in the worst corrosion resistance and most metal release, while the amount and composition of surface oxide remained at a similar level as in the absence of both. The effect of H _(2) O _(2) inducing low compactness of surface oxides should prevail on deciding the poor corrosion protection ability of passive film, while albumin simultaneously promoted dissolution or inhibited formation of oxides due to H _(2) O _(2) . Corrosion resistance was consistently lower for Co–35Ni–20Cr–10Mo under each condition, the only alloy where the synergistic effect of both species was clearly demonstrated. This work suggests that the complexity of the environment must be considered for corrosion resistance evaluation of biomedical alloys.
机译：研究了作为生物医学合金的Co–28Cr–6Mo和Co–35Ni–20Cr–10Mo的腐蚀对生理盐水中典型物种（白蛋白和H _（2）O _（2））的影响及其共存性第一次探索。进行了电化学和长期浸没测试。研究发现，钴合金对单独存在的白蛋白不敏感，白蛋白的存在可略微促进Co–35Ni–20Cr–10Mo的阳极溶解，而不会显着影响Co–28Cr–6Mo的溶解，并促进氧化膜在两种合金上的溶解。 H _（2）O _（2）导致耐蚀性明显下降，有利于金属的释放和表面氧化物的形成，并导致两种合金的氧化膜厚得多但致密性降低。两种物质的共存导致最差的耐腐蚀性和最多的金属释放，而表面氧化物的量和组成保持与没有两种氧化物时相似的水平。 H _（2）O _（2）引起的表面氧化物致密性低的影响应优先于决定钝化膜的耐腐蚀能力差，而白蛋白同时促进H _（2）O引起的氧化物溶解或抑制形成_（2）。在每种条件下，Co–35Ni–20Cr–10Mo的耐蚀性始终较低，这是唯一明确表明两种物质具有协同作用的合金。这项工作表明，在评估生物医学合金的耐腐蚀性时必须考虑环境的复杂性。

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