Corrosion Resistance of Graphite-like Carbon Coating on GW93 Magnesium Deposited by Magnetron Sputtering

Guo Qiaoqin; Li Jianping

doi:10.15980/j.tzzz.2013.03.014

Views : 0 下载量: 169 CSCD: 1

Export
Share
Collection
Album

Corrosion Resistance of Graphite-like Carbon Coating on GW93 Magnesium Deposited by Magnetron Sputtering
Vol. 33, Issue 3, Pages: 212-215(2013)
Published： 2013 ，
DOI： 10.15980/j.tzzz.2013.03.014

扫描看全文

[1]郭巧琴,李建平.GW93镁合金磁控溅射类石墨镀层的耐蚀性[J].特种铸造及有色合金,2013,33(03):212-215.

Guo Qiaoqin, Li Jianping. Corrosion Resistance of Graphite-like Carbon Coating on GW93 Magnesium Deposited by Magnetron Sputtering. [J]. Special Casting & Nonferrous Alloys 33(3):212-215(2013)
[1]郭巧琴,李建平.GW93镁合金磁控溅射类石墨镀层的耐蚀性[J].特种铸造及有色合金,2013,33(03):212-215. DOI： 10.15980/j.tzzz.2013.03.014.

Guo Qiaoqin, Li Jianping. Corrosion Resistance of Graphite-like Carbon Coating on GW93 Magnesium Deposited by Magnetron Sputtering. [J]. Special Casting & Nonferrous Alloys 33(3):212-215(2013) DOI： 10.15980/j.tzzz.2013.03.014.

摘要

通过对铸造GW93镁合金表面非平衡磁控溅射沉积的类石墨镀层的交流阻抗谱和塔菲尔曲线的电化学研究

定量分析了类石墨镀层的耐蚀性

并用失重法对电化学测试结果进行了进一步验证。利用扫描电镜（SEM）研究了类石墨镀层表面微观结构对其耐蚀性的影响。结果表明

非平衡磁控溅射类石墨镀层由Cr层

过渡层和C层组成

薄膜生长方式为岛状生长。类石墨镀层在本底真空度为8.8×10-3Pa时

可将GW93镁合金的电化学阻抗提高到5.0×1019Ω

自腐蚀电位提高到-0.940V

从而改善镁合金的耐蚀性。本底真空度是影响GW93镁合金磁控溅射镀类石墨镀层耐蚀性一个重要因素

真空度越大

其耐蚀性越好。

Abstract

The corrosion resistance of the graphite-like carbon coating on the cast GW93 magnesium alloy deposited by non-equilibrium magnetron sputtering was investigated through electrochemical methods as EIS and the Tafel polarization curves validated by agravity.Microstructure was observed by SEM and to analyze the influence on corrosion resistance.The results show that the composite coating is composed of chromium layer

transition layer and carbon layer.The growth modes of the coating are characterized by island structure.The graphite-like carbon coating can improve the corrosion resistance of the GW93 magnesium alloy as a result of improving the EIS to 5.0×1019 Ω and the self-corrosion potential to-0.940 V with background vacuum degree of 8.8×10-3 Pa.The background vacuum degree is a important factor influencing the corrosion resistance of graphite-like carbon coating

where corrosion resistance of the coating is improved increasingly with the increasing in background vacuum degree.