回归再时效对6082合金组织及电化学腐蚀性的影响
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摘要
采用电化学方法研究了经不同回归再时效工艺处理的6082铝合金在3.5%的NaCl溶液中的腐蚀行为,通过显微组织、XRD和极化曲线分析发现,6082铝合金组织为α-Al基体上均匀分布且取向明显的β-Mg2Si颗粒及单质Si;回归处理后铝合金基体中几乎没有强化相,再时效晶内析出细小弥散的强化相,晶界上形成粗大断续状的平衡态组织。回归工艺为220℃×40min与220℃×60min时可以提高6082铝合金耐电化学腐蚀性能。
The corrosion behavior of 6082 aluminum alloy after different retrogression reaging treatment in 3.5%NaCl solution was analyzed by electrochemical method,microstructural observation,XRD and polarization curves.The results show that the microstructure of 6082 aluminum alloy is composed of a uniform distribution of beta-Mg2 Si particles and elementary Si with obvious orientation on the matrix ofα-Al solid solution.After regression treatment,there are almost no strenghening phases in the aluminum alloy matrix,and then the fine diffuse strengthening phase is precipitated in the grain after reaging treatment,and a large discontinuous equilibrium structure is formed on the grain boundary.The electrochemical corrosion resistance of 6082 aluminium alloy can be improved by the re-aging process of 220℃×40min and 220℃×60min.
The corrosion behavior of 6082 aluminum alloy after different retrogression reaging treatment in 3.5%NaCl solution was analyzed by electrochemical method,microstructural observation,XRD and polarization curves.The results show that the microstructure of 6082 aluminum alloy is composed of a uniform distribution of beta-Mg2 Si particles and elementary Si with obvious orientation on the matrix ofα-Al solid solution.After regression treatment,there are almost no strenghening phases in the aluminum alloy matrix,and then the fine diffuse strengthening phase is precipitated in the grain after reaging treatment,and a large discontinuous equilibrium structure is formed on the grain boundary.The electrochemical corrosion resistance of 6082 aluminium alloy can be improved by the re-aging process of 220℃×40min and 220℃×60min.
引文
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[4]钟飞,史耀武,李晓延,等.航空轻质合金及其激光焊接头盐雾腐蚀行为研究[J].材料工程,2006(S1):161-166.
[5]王月,付自来,张燕阳.含钪铝合金焊接接头的耐腐蚀性能研究[J].材料开发与应用,2007,22(3):602-644.
[6]龚静,汪明,张茜,等.RRA处理对1973铝合金晶间腐蚀与剥蚀的影响[J].中南大学学报(自然科学版),2012,43(7):2 520-2 527.
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[8]蔡一鸣,梁霄鹏,李慧中,等.热处理制度对7039铝合金抗腐蚀性能的影响[J].中南大学学报(自然科学版),2009,40(6):1 540-1 545.
[9]冯春,刘志义,宁爱林,等.RRA处理对超高强铝合金抗应力腐蚀性能的影响[J].中南大学学报(自然科学版),2006,37(6):1 054-1 059.
[10]曾渝,尹志民,朱远志,等.RRA处理对超高强铝合金微观组织与性能的影响[J].中国有色金属学报,2004,14(7):1 188-1 194.
[11]韩念梅,张新明,刘胜胆,等.回归再时效对7050铝合金强度和断裂韧性的影响[J].中国有色金属学报,2012,22(7):1 871-1 882.
[12]钱兆红.铝在中性介质中腐蚀特性的电化学和原位SECM研究[D].济南:山东大学,2012.
[13]张坤,刘志义,郑青春.高Zn超高强铝合金的回归再时效处理[J].中南大学学报(自然科学版),2005,36(2):188-192.
[14]李科,甘卫平.热处理工艺对6063铝合金组织和力学性能的影响[J].铝加工,2005,161(3):2-10.