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超声滚压对6061铝合金第二相诱发局部腐蚀的影响
Effect of ultrasonic rolling on local corrosion induced by second phase of 6061 aluminum alloy

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樊磊 1   李波 1   何锦航 1   白洁 1   毛进 2   张有佳 3   黄朝文 4   李伟 4   石维 4 *  
文摘 采用超声滚压技术(USRP)改变6061铝合金表层,实现不同静压力下USRP对6061铝合金第二相组织的改变,从而提高铝合金的耐腐蚀性能。使用SEM,SKPFM以及激光共聚焦等手段,基于微区电偶腐蚀原理,在考虑溶液阻抗与氧化物阻抗的条件下,得出第二相尺寸与局部腐蚀发展的关联规律,并利用激光共聚焦显微镜原位观察,验证第二相尺寸对局部腐蚀发展的影响。结果表明:当铝合金表层经0.10MPa静压力滚压时,在3.5%(质量分数)NaCl溶液中的初期自腐蚀电流密度仅为未处理试样的1/15,腐蚀速率降低了93.04%。Mg2Si相在滚压过程中并未发生显著形态变化,对USRP前后腐蚀性能变化无显著影响。长条状连续分布的AlFeSi相会在USRP作用下细化为微纳尺度的弥散状分布。充分细化后的AlFeSi相会因腐蚀微电池的局部阴阳极面积比减少而减弱电偶腐蚀效应,虽会促进铝合金基体的亚稳态点蚀形核率,但同时也会造成自身的快速溶解。当自溶解发生或在亚稳态蚀孔内壁形成Al_2O_3氧化膜保护时, AlFeSi相对铝合金基体电偶腐蚀效应大幅减弱,从而提高6061铝合金整体的耐腐蚀性能。
其他语种文摘 USRP(ultrasonic surface rolling processing)was used to change the surface layer of 6061 aluminum alloy,so as to realize the change of the second phase microstructure of 6061aluminum alloy by USRP under different static pressure conditions to improve corrosion resistant,which was characterized by using scanning electron microscopy,laser confocal microscopy,scanning Kelvin probe force microscopy,etc.Based on the principle of microzone galvanic corrosion and considering the impedance of solution and oxide,the correlation law between the size of the second phase and the development of local corrosion was obtained.The effect of the size of the second phase on the development of local corrosion was verified by in-situ observation using laser confocal microscope. The results show that the initial self-corrosion current density of aluminum alloy in 3.5%(mass fraction)NaCl solution is only 1/15of that of the untreated sample,the corrosion rate is reduced by 93.04%,when the surface layer is rolled with 0.10 MPa static pressure.The Mg2Si phase has no significant morphology change during the rolling process,and it has no significant effect on the corrosion performance before and after USRP.The AlFeSi phases with long strip continuous distribution are refined into micro-and nano-scale dispersion distributions under the action of USRP. The fully refined AlFeSi phase weakens the galvanic corrosion effect due to the reduction of the local anode/cathode area ratio of the corrosion microcell,which promotes the metastable pitting nucleation rate of the aluminum alloy matrix,but also cause the rapid dissolution of the aluminum alloy itself. When self-dissolution occurs or Al_2O_3oxide film is formed in the inner wall of metastable corrosion hole,the electrochemical corrosion effect of AlFeSi relative to aluminum alloy matrix is greatly weakened,so as to improve the corrosion resistance of 6061aluminum alloy as a whole.
来源 材料工程 ,2023,51(9):128-139 【核心库】
DOI 10.11868/j.issn.1001-4381.2022.000571
关键词 6061铝合金 ; 超声滚压 ; AlFeSi相 ; 局部腐蚀 ; 电偶腐蚀
地址

1. 贵州电网有限责任公司电力科学研究院, 贵阳, 550000  

2. 贵州创星电力科学研究院有限责任公司, 贵阳, 550002  

3. 东北电力大学建筑工程学院, 吉林, 吉林, 132000  

4. 贵州大学材料与冶金学院, 贵阳, 550025

语种 中文
文献类型 研究性论文
ISSN 1001-4381
学科 金属学与金属工艺
基金 南方电网科技攻关项目
文献收藏号 CSCD:7574276

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