| ZHAO Peng-fei,GUO Wen-ying,TAO Yang,WEN Lei,WU Jun-sheng,WEI Xiao-qin.Accelerated Corrosion Behavior and Mechanism of Coated Alloy Ateel by Cyclic Salt-spray Test[J],51(4):236-246 |
| Accelerated Corrosion Behavior and Mechanism of Coated Alloy Ateel by Cyclic Salt-spray Test |
| Received:April 10, 2021 Revised:August 12, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2022.04.024 |
| KeyWord:coated alloy steel cyclic salt-spray test corrosion behavior and mechanism electrochemical measurement |
| Author | Institution |
| ZHAO Peng-fei |
Aerospace Science & Industry Corp Defense Technology R&T Center, Beijing , China |
| GUO Wen-ying |
Aerospace Science & Industry Corp Defense Technology R&T Center, Beijing , China |
| TAO Yang |
Aerospace Science & Industry Corp Defense Technology R&T Center, Beijing , China |
| WEN Lei |
University of Science and Technology Beijing, Beijing , China |
| WU Jun-sheng |
University of Science and Technology Beijing, Beijing , China |
| WEI Xiao-qin |
Southwest Technology and Engineering Research Institute, Chongqing , China |
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| Abstract: |
| This paper aims to study the corrosion behavior and mechanism of coated alloy steel under the laboratory simulation and strengthened corrosion environment, and establish the accelerated test methods for evaluating the corrosion life of coated steel.Utilizing the designed test spectrum of accelerated corrosion environment in laboratory simulation, cyclic salt-spray accelerated corrosion tests were performed to simulate the marine atmospheric environment effect. By such instruments as appearance inspection, SEM, XRD, electrochemical measurement etc., the corrosion performance of specimens with different exposure time, such as corrosion weight loss, corrosion morphology, corrosion product composition, polarization curves and impedance spectroscopy were characterized. Accelerated corrosion behavior and mechanism of coated alloy steel were analyzed and concluded. As the corrosion exposure time progresses, corrosion weight loss of the coated alloy steel specimen conformed to the power function law, the corrosion rate decreased, increased and decreased. The surface morphology transited gradually from corrosion products of the coating layer to the rust layer of substrate metal, and the main chemical constituents of corrosion products from hydroxy-zinc-chloride and zinc-hydroxide to iron-hydroxide gradually. The corrosion current density fitted by polarization curves fluctuated around the average value, and the corrosion potential fluctuated upwards. Capacitive loops of electrochemical impedance spectroscopy varied from one to two, and the low and medium frequency of capacitive loops appeared a straight line representing typical characteristics of Warburg impedance. Therefore conclusions are obtained as follows,the accelerated effect is significant for the coated alloy steel corrosion by cyclic salt-spray test, the corrosion behavior and mechanism of coated alloy steel are more comprehensively characterized from such aspects as corrosion kinetics, morphology and constitutes of corrosion products, and electrochemical mechanism to provide conditions for further investigating the simulation and correlation of accelerated corrosion test. |
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