| QIAN Ang,JIN Ping,TAN Xiao-ming,WANG De.Corrosion and Electrochemical Properties of AerMet100 Steel in Salt Fog[J],47(10):231-239 |
| Corrosion and Electrochemical Properties of AerMet100 Steel in Salt Fog |
| Received:July 07, 2018 Revised:October 20, 2018 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2018.10.031 |
| KeyWord:AerMet100 steel salt spray test micro area electrochemistry scanning kelvin probe (SKP) corrosion products corrosion mechanism |
| Author | Institution |
| QIAN Ang |
Naval Aeronautical University Qingdao Campus, Qingdao , China |
| JIN Ping |
Naval Aeronautical University Qingdao Campus, Qingdao , China |
| TAN Xiao-ming |
Naval Aeronautical University Qingdao Campus, Qingdao , China |
| WANG De |
Naval Aeronautical University Qingdao Campus, Qingdao , China |
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| Abstract: |
| The work aims to study the corrosion and electrochemical characteristics of AerMet100 steel in salt fog, and analyze its corrosion mechanism. The corrosion behavior and corrosion morphology of AerMet100 steel were observed and analyzed by salt spray test, and the composition of corrosion products was analyzed. The polarization curves and electrochemical impedance spectra of salt spray test after different time were tested and the equivalent circuit model was set up. The equivalent circuit and polarization curve were fitted by Cview and Zsimp Win software. The self corrosion potential, self corrosion current and equivalent element value were calculated, and the regularities of the transformation were analyzed quantitatively. The correctness of equivalent circuit fitting was verified by K-K transformation. Scanning kelvin probe (SKP) was used to test the surface potential of rusted samples after salt spray test for different time, and Gaussian fitting was applied to analyze its potential distribution and change rule. Finally, the corrosion mechanism of AerMet100 steel in salt fog was analyzed based on the test results. The corrosion form of AerMet100 steel gradually developed from pitting corrosion to uniform corrosion in the salt spray test. The corrosion products were divided into two layers: the main component of the outer rust layer was β-FeOOH and the main component of the inner rust layer was Fe3O4 and γ-Fe2O3. The inner rust layer was more compact than the outer rust layer. After 9-day salt spray test, the corrosion potential was ?593.178 mV, the corrosion current was 3.919 μA, the corrosion product layer resistance was 4.152 ??cm2, and the corrosion resistance was 2748 ??cm2. At this time, the corrosion tendency of the sample was the lowest, and the accumulation of corrosion products decreased the rate of corrosion reaction. The surface potential of the sample without corrosion was ?842.387 mV, and the potential was ?701.686 mV after 6-day salt spray test. After 12-day salt spray test, the potential was ?575.502 mV. With the prolongation of the salt spray test time, the average potential of the sample increased, the potential distributed dispersedly and the potential difference increased. Cathode area and the anode area were formed obviously. The corrosion product layer on the surface of AerMet100 steel can effectively prevent the penetration and diffusion of corrosion solution to the matrix, postpone the corrosion process and play a better protective effect on the matrix. |
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