微弧氧化处理对6061铝合金电偶腐蚀防护
6061 Aluminium Alloy Protected from Galvanic Corrosion by Micro-arc Oxidation Treatment
李鹏飞 1郭泉忠 2王勇 2左晓姣 1汪川2
作者信息
- 1. 沈阳工业大学 材料科学与工程学院,沈阳 110870
- 2. 中国科学院金属研究所,沈阳 110016;辽宁沈阳土壤大气环境材料腐蚀国家野外科学观测研究站,沈阳 110016
- 折叠
摘要
目的 提高船舶上铝合金的耐蚀性能.方法 使用双极性脉冲电源对6061铝合金进行微弧氧化处理,并使用环氧树脂进行封孔,通过电化学测试、扫描电子显微镜(SEM)、能谱仪(EDS)、浸泡腐蚀试验和电偶腐蚀试验等方法,对膜层的表面形貌、截面形貌、物相组成和耐蚀性能进行测试.结果 制备的 6061 铝合金微弧氧化膜层厚度约为 40 μm,致密均匀.在 240 h浸泡试验后,仍具有较强的耐蚀性,与 316L不锈钢耦合的电流密度从约 47 μA/cm2 下降到 20 μA/cm2 左右,对 6061 铝合金的耐蚀性有显著提升.封孔处理后,浸泡腐蚀 240 h,未发现明显腐蚀,电偶电流进一步下降到 11 μA/cm2.结论 对 6061 铝合金进行微弧氧化处理,可以有效提高其耐蚀性能,对电偶腐蚀有较好的抑制作用,封孔处理则可以进一步提高铝合金的耐蚀性能.
Abstract
The work aims to improve the corrosion resistance of aluminum alloys on ships.The 6061 aluminium alloy was subject to micro-arc oxidation treatment with a bipolar pulsed power supply and was sealed with epoxy resin.The surface mor-phology,cross-section morphology,physical phase composition,and corrosion resistance of the resulting film layer were tested through electrochemical testing,SEM observation,EDS,immersion corrosion experiments,and galvanic coupling corrosion tests.The micro-arc oxidation film prepared on the 6061 aluminium alloy had a thickness of approximately 40 μm,and it was both dense and uniform.After a 240-hour immersion experiment,the corrosion resistance of the material remained strong.The coupling current density of 316L stainless steel decreased from approximately 47 μA/cm2 to about 20 μA/cm2,and the corrosion resistance of 6061 aluminium alloy was significantly improved.No obvious corrosion was found after hole sealing treatment followed by the 240-hour immersion and the electric coupling current decreased to 11 μA/cm2.The corrosion resistance of the 6061 aluminium alloy can be effectively improved through micro-arc oxidation treatment which also has good inhibition effect on galvanic corrosion.Additionally,the corrosion resistance of the aluminium alloy can be further improved through hole seal-ing treatment.
关键词
铝合金/微弧氧化/封孔/电化学/电偶腐蚀/腐蚀过程Key words
aluminium alloy/micro-arc oxidation/hole sealing/electrochemistry/galvanic corrosion/corrosion process引用本文复制引用
基金项目
国家重点研发计划(2021YFC2803102)
沈阳市自然科学基金专项(23503605)
出版年
2024
NETL
NSTL
万方数据