LOCALIZED CORROSION CURRENTS AND PH PROFILE OVER B_4C, SiC AND Al_2O_3 REINFORCED 6092 ALUMINUM COMPOSITES IN ARTIFICIAL SEA WATER

机译：人工海水中B_4C，SiC和Al_2O_3增强的6092铝复合材料中的局部腐蚀电流和pH分布

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Particulate 6092-T6 Al metal matrix composites (MMCs) reinforced with 20 vol. % of B_4C, SiC and Al_2O_3 exhibited localized corrosion when immersed in ASTM seawater exposed to air at room temperature. The scanning vibrating electrode technique revealed that corrosion initiated at localized anodic regions, which transformed into cathodic regions over time. The scanning ion-selective electrode technique revealed that the localized anodic regions were acidified, and the localized cathodic regions were alkalinized. The observed anodic-cathodic transformation behavior was attributed to the amphoteric nature of aluminum and the relation of the local potential of aluminum to the local solution pH. Scanning electron microscope and energy dispersive spectrometer revealed that 1) the corrosion was most severe for the MMC reinforced with B_4C, 2) micro-crevices formed around SiC reinforcement particles for SiC reinforced MMCs, and 3) localized corrosion initiated at Ti-containing particles for Al_2O_3 reinforced MMCs.

机译：颗粒2092-T6 Al金属基复合材料（MMC）增强当B_4C，SiC和Al_2O_3中的％浸入室温下暴露于空气的ASTM海水中时，会表现出局部腐蚀。扫描振动电极技术表明，腐蚀始于局部阳极区域，随着时间的推移，腐蚀区域转变为阴极区域。扫描离子选择电极技术表明，局部化的阳极区域被酸化，局部化的阴极区域被碱化。观察到的阳极-阴极转变行为归因于铝的两性性质以及铝的局部电位与局部溶液pH的关系。扫描电子显微镜和能谱仪显示：1）B_4C增强的MMC腐蚀最严重； 2）SiC增强的MMC的SiC增强颗粒周围形成微缝隙； 3）含Ti的Ti颗粒开始局部腐蚀。 Al_2O_3增强MMC。

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《Proceedings vol.2004-14; Electrochemical Society(ECS) International Meeting and Symposium on Corrosion in Marine and Saltwater Environments II; 20041003-08; Honolulu,HI(US)》|2004年|P.484-495|共12页
会议地点 HonoluluHI(US)
作者
Hongbo Ding; L. H. Hihara;
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Department of Mechanical Engineering, University of Hawaii at Manoa, Honolulu, HI, 96822;

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正文语种 eng
中图分类材料腐蚀与保护;
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LOCALIZED CORROSION CURRENTS AND PH PROFILE OVER B_4C, SiC AND Al_2O_3 REINFORCED 6092 ALUMINUM COMPOSITES IN ARTIFICIAL SEA WATER

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