| SHEN Yuan-yuan,CHEN Chao-yi,LI Jun-qi,FU Hui,YANG Xia-qiong.Salt Spray Corrosion Behavior of 0359 Aluminum Alloy Used in Radiator of Wind Power System[J],46(10):22-28 |
| Salt Spray Corrosion Behavior of 0359 Aluminum Alloy Used in Radiator of Wind Power System |
| Received:May 22, 2017 Revised:October 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.10.004 |
| KeyWord:0359 aluminum alloy marine atmospheric environment salt spray corrosion pitting oxygen-consuming corrosion polarization curve |
| Author | Institution |
| SHEN Yuan-yuan |
1.School of Material and Metallurgy, Guizhou University, Guiyang , China; 2.Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang , China |
| CHEN Chao-yi |
1.School of Material and Metallurgy, Guizhou University, Guiyang , China; 2.Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang , China |
| LI Jun-qi |
1.School of Material and Metallurgy, Guizhou University, Guiyang , China; 2.Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang , China |
| FU Hui |
1.School of Material and Metallurgy, Guizhou University, Guiyang , China; 2.Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang , China |
| YANG Xia-qiong |
1.School of Material and Metallurgy, Guizhou University, Guiyang , China; 2.Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang , China |
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| Abstract: |
| The work aims to study corrosion behavior of 0359 aluminum alloy, and predict its corrosion service life. Salt spray test was performed to simulate marine atmosphere. SEM, EDS, corrosion depth, corrosion weight loss, polarization curve and impedance of corrosive sample were analyzed. Under the condition of salt fog corrosion experiment, corrosion products mainly included O, Al and Si. With the extension of corrosion time, corrosion points and corrosion products increased, some corrosion products dissolved and fell off, corrosion weight loss increased, and corrosion pits largened and deepened. When corrosion time increased from 8 h to 72 h, corrosion potential moved from −852.859 mV to −966.046 mV negatively, corrosion current density increased from 0.346 μA/cm2 to 3.971 μA/cm2, corrosion impedance reduced and corrosion rate increased. When the corrosion time was 96 h, corrosion potential moved positively, corrosion current density decreased, corrosion impedance increased and corrosion rate decreased. Corrosion weight loss-time fitting curve of 0359 alloy was y1=0.1927t0.6997, and fitting corrosion weight loss of LC4 aluminum was 3.2629 g/m2 during 10 years of outdoor exposure in Wanning. Equivalent corrosion depth of 0359 aluminum alloy was 43.80 μm during 10 years of outdoor exposure, which accounted for 17.52% of slice thickness. Corrosion morphology of 0359 aluminum alloy is pitting, and Al is subject to oxygen-consuming corrosion. At the beginning of corrosion, passive film on the surface of 0359 aluminum alloy prevents corrosion. With the extension of corrosion time, passive film is gradually destroyed, and corrosion rate increases. At later stage of corrosion, the sample is covered by a lot of corrosion products, thus hindering contact between O and Cl− with aluminum alloy and reducing corrosion rate. Passive film and corrosion products on the 0359 aluminum alloy slow down corrosion, and the service of 0359 aluminum alloy is over 10 years. |
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