[金涂层对镍铬合金耐腐蚀性的影响]

[Effect of aurum coating on corrosion resistance of Ni-Cr alloy].

作者信息

Chen Zhi-hong, Liu Li, Mao Ying-jie

机构信息

Department of Prosthodontics, Hospital of Stomatology, College of Medicine, Zhejiang University, Hangzhou 310006, China.

出版信息

Zhonghua Kou Qiang Yi Xue Za Zhi. 2007 Feb;42(2):118-21.

PMID:17462162

Abstract

OBJECTIVE

To evaluate the effect of aurum coating on corrosion resistance of Ni-Cr alloy in artificial saliva environment.

METHODS

The corrosion potential (E(corr)), self-corrosion current density (I(corr)), and polarization resistance (R(p)) of three alloys were measured using electrochemical methods to compare the difference of corrosion resistance between aurum-coated Ni-Cr alloy and Ni-Cr alloy or Au alloy. Meanwhile, microstructural and phase diffraction was examined with field scanning electromicroscopy (FSEM) and surface chemical analysis was performed by energy diffraction X-ray (EDX).

RESULTS

The I(corr) of aurum-coated Ni-Cr alloy was (0.70 +/- 0.20) x 10(-6) A/cm2, which was significantly higher than that of Au alloy (P < 0.05) and lower than that of Ni-Cr alloy (P < 0.05). R(p) of aurum-coated Ni-Cr alloy was (34.77 +/- 12.61) KOmega.cm2, which was higher than that of Ni-Cr alloy (P < 0.05) and lower than that of Au alloy (P < 0.05). The results of FSEM showed that the corrosion resistance of Ni-Cr alloy coated with aurum was better than that of Ni-Cr alloy. The results of EDX indicated that released Ni and Cr of Ni-Cr alloy coated with aurum after test were less than those of Ni-Cr alloy (P < 0.05).

CONCLUSIONS

The corrosion resistance of aurum-coated Ni-Cr alloy is higher than that of Ni-Cr alloy.

摘要

目的

评估金涂层对镍铬合金在人工唾液环境中耐腐蚀性的影响。

方法

采用电化学方法测量三种合金的腐蚀电位（E(corr)）、自腐蚀电流密度（I(corr)）和极化电阻（R(p)），以比较金涂层镍铬合金与镍铬合金或金合金之间的耐腐蚀性差异。同时，用场发射扫描电子显微镜（FSEM）检查微观结构和相衍射，并用能量色散X射线（EDX）进行表面化学分析。

结果

金涂层镍铬合金的I(corr)为(0.70±0.20)×10(-6) A/cm2，显著高于金合金（P<0.05）且低于镍铬合金（P<0.05）。金涂层镍铬合金的R(p)为(34.77±12.61) KΩ·cm2，高于镍铬合金（P<0.05）且低于金合金（P<0.05）。FSEM结果表明，金涂层镍铬合金的耐腐蚀性优于镍铬合金。EDX结果表明，测试后金涂层镍铬合金释放的镍和铬少于镍铬合金（P<0.05）。