CAJ | 학술논문

通过剥落腐蚀试验、静态失重分析和动电位极化曲线测试对比研究了搅拌摩擦焊接（FSW）6063铝合金焊缝与母材的腐蚀特性，借助光学显微镜和扫描电子显微镜观察焊缝和母材的微观组织及腐蚀形貌．结果表明：经过48 h的腐蚀试验，母材点蚀严重并伴随着局部剥落腐蚀，而搅拌摩擦焊缝没有出现明显的点蚀现象．焊缝的自腐蚀电位比母材高，分别为-666 V和-704 V，焊缝和母材的平均腐蚀速率分别为0.379 g/（ m2· h）和2.186 g/（ m2· h）．在搅拌摩擦焊接过程中，晶粒细化及第二相的均匀分布和减少是焊缝耐蚀性能提高的主要原因．
통과박락부식시험、정태실중분석화동전위겁화곡선측시대비연구료교반마찰한접（FSW）6063려합금한봉여모재적부식특성，차조광학현미경화소묘전자현미경관찰한봉화모재적미관조직급부식형모．결과표명：경과48 h적부식시험，모재점식엄중병반수착국부박락부식，이교반마찰한봉몰유출현명현적점식현상．한봉적자부식전위비모재고，분별위-666 V화-704 V，한봉화모재적평균부식속솔분별위0.379 g/（ m2· h）화2.186 g/（ m2· h）．재교반마찰한접과정중，정립세화급제이상적균균분포화감소시한봉내식성능제고적주요원인．
The 6063 aluminum alloy plates were welded by friction stir welding ( FSW).The corrosion properties of friction stir welding seams and base materials were studied by the methods of static gravimet-ric , exfoliation corrosion and polarization curves .Their microstructure and corrosion morphology were ob-served by the Optical Microscope ( OM ) and Scanning Electron Microscope ( SEM ) .The results show that:after 48 h corrosion , the pitting corrosion on base materials was serious , and there was partly exfoli-ation corrosion on base materials too .However , the pitting corrosion on welding seams was not obvious after friction stir welding .Furthermore, the self-corrosion potential of welding seams is higher than that of base materials , and they are -666 V and -704 V respectively .The average corrosion rate of the weld-ing seams is far less than that of the base materials , and the value is 0.379 g/( m2 · h) and 2.186 g/(m2· h) respectively.The small grains and the dissolution at the second phase are primary reasons for the improvement of the corrosion resistance of welding seams during the FSW .