摘要
对铝合金表面非平衡磁控溅射沉积类石墨镀层,采用极化曲线测试和质量损失方法,分析了镀层的耐蚀性;利用扫描电子显微镜对镀层腐蚀前后的微观形貌进行了观察。结果表明,铝合金表面磁控溅射类石墨镀层由铬打底层和碳工作层组成。镀层组织细小,均匀致密,类石墨镀层可以提高铝合金的耐蚀性。随基体负偏压增大,铝合金试样的耐蚀性增加,当基体为-120 V偏压时,铝合金基体的自腐蚀电位由-0.452 V提高到-0.372 V,腐蚀电流由10.62 m A减小到3.67 m A。在Na Cl溶液中进行浸泡试验后,类石墨镀层仅发生了部分点蚀,可很好地保护铝合金基体。
Corrosion resistance of graphite-like coating（ GLC） deposited via magnetron sputtering on aluminum alloy surface was analyzed by polarization curves testing and mass lossing method; microscopic morphology of the coating before and after corrosion were observed by scanning electron microscope（ SEM）. Results showed that the coating was composed of Cr layer and carbon layer. Due to the fine,uniform and dense coating microstructure,the GLC could improve the corrosion resistance of aluminum alloy.And the corrosion resistance of aluminum alloy sample would increase with substrate negative bias increasing,when the substrate negative bias was- 120 V,self-corrosion potential of the aluminum alloy substrate increased from- 0. 452 V to- 0. 382 V,and corrosion current decreased from 10. 62 mA to3. 67 mA. After immersion test in Na Cl solution,only some pitting occurred in the GLC,which could protecting the aluminum alloy substrate well.
出处
《电镀与精饰》
CAS
北大核心
2015年第5期6-8,18,共4页
Plating & Finishing
基金
陕西省西安市科技计划项目(CXY1442(2))
陕西省自然科学基础研究计划项目(2014JQ2-5027)
