Chao Zhang, Yaomu Xiao, Chufeng Liu, Conghua Liu
The Stomatological Hospital of Southern Medical University, Guangdong Provincial Stomatological Hospital, No. 366 South of Jiangnan Road, Guangzhou, 510280, People's Republic of China.
Biometals. 2017 Jun;30(3):367-377. doi: 10.1007/s10534-017-0012-3. Epub 2017 Mar 25.
In this study, Ni-Ti alloy and stainless steal were exposed to artificial saliva containing fibrinogen, IgG or mucin, and the resultant corrosion behavior was studied. The purpose was to determine the mechanisms by which different types of protein contribute to corrosion. The effect of different proteins on the electrochemical resistance of Ni-Ti and SS was tested by potentiodynamic polarization, and the repair capacity of passivation film was tested by cyclic polarization measurements. The dissolved corrosion products were determined by ICP-OES, and the surface was analyzed by SEM and AFM. The results showed fibrinogen, IgG or mucin could have different influences on the susceptibility to corrosion of the same alloy. Adding protein lead to the decrease of corrosion resistance of SS, whereas protein could slow down the corrosion process of Ni-Ti. For Ni-Ti, adding mucin could enhance the corrosion stability and repair capacity of passivation film. The susceptibility to pitting corrosion of Ni-Ti and stainless steal in fibrinogen AS is not as high as mucin and IgG AS. There are different patterns of deposition formation on the metal surface by different types of protein, which is associated with their effects on the corrosion process of the alloys.
在本研究中，将镍钛合金和不锈钢暴露于含有纤维蛋白原、免疫球蛋白G（IgG）或粘蛋白的人工唾液中，并研究由此产生的腐蚀行为。目的是确定不同类型蛋白质导致腐蚀的机制。通过动电位极化测试不同蛋白质对镍钛合金和不锈钢耐电化学性能的影响，并通过循环极化测量测试钝化膜的修复能力。通过电感耦合等离子体发射光谱法（ICP - OES）测定溶解的腐蚀产物，并通过扫描电子显微镜（SEM）和原子力显微镜（AFM）对表面进行分析。结果表明，纤维蛋白原、IgG或粘蛋白对同一合金的腐蚀敏感性可能有不同影响。添加蛋白质会导致不锈钢耐腐蚀性降低，而蛋白质可减缓镍钛合金的腐蚀过程。对于镍钛合金，添加粘蛋白可增强钝化膜的腐蚀稳定性和修复能力。镍钛合金和不锈钢在含纤维蛋白原的人工唾液中的点蚀敏感性不如含粘蛋白和IgG的人工唾液高。不同类型蛋白质在金属表面形成的沉积模式不同，这与它们对合金腐蚀过程的影响有关。
