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| Crevice Corrosion Behavior of 6A01-T5 Aluminum Alloy/304 Stainless Steel |
| Received:August 22, 2023 Revised:September 14, 2023 |
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| DOI：10.7643/issn.1672-9242.2024.01.014 |
| KeyWord:6A01-T5 aluminum alloy 304 stainless steel crevice corrosion dissimilar metal alkaline NaCl solution |
| Author | Institution |
| SUN Xiaoguang |
CRRC Qingdao Sifang Co., Ltd., Shandong Qingdao , China |
| WANG Pengyue |
CRRC Qingdao Sifang Co., Ltd., Shandong Qingdao , China |
| WANG Rui |
CRRC Qingdao Sifang Co., Ltd., Shandong Qingdao , China |
| WANG Gang |
CRRC Qingdao Sifang Co., Ltd., Shandong Qingdao , China |
| TAI Chuang |
Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China |
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| Abstract: |
| The work aims to study the crevice corrosion behavior of 6A01-T5 aluminum alloy and 304 stainless steel. The corrosion behavior of 6A01-T5 aluminum alloy/304 stainless steel crevice structure in alkaline NaCl solution was studied by immersion corrosion method at normal temperature and pressure combined with SEM, EDS, XRD and white light interference detection. The crevice corrosion of 6A01-T5 aluminum alloy/304 stainless steel was manifested as a concave channel along the crevice direction, which was dominated by local thinning and corrosion pits in the crevice, and the corrosion degree gradually increased with the extension of corrosion time. The morphology and composition of the corrosion products in different areas were different. The corrosion products in the exposed area were crystalline particles, and the main components were CaCO3 and Al(OH)3 aluminum corrosion products. A layer of corrosion product covered with obvious boundary was formed in the crevice direction. The corrosion products inside the crevice were relatively few, composed of a relatively small-sized blocks, and the main components were Al(OH)3 and other related products.In the case of non-electric connection between 6A01-T5 aluminum alloy and 304 stainless steel, the two kinds of metals in the 6A01-T5 aluminum alloy /304 stainless steel crevice corrosion occurs independently. Because the two kinds of metals compete for O2 in the corrosion process, the 304 stainless steel can inhibit the crevice corrosion of 6A01-T5 aluminum alloy. |
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