赵朋飞,郭文营,陶阳,文磊,吴俊升,魏小琴.含镀层合金钢循环盐雾加速腐蚀行为与机理研究[J].表面技术,2022,51(4):236-246.
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].Surface Technology,2022,51(4):236-246 |
| 含镀层合金钢循环盐雾加速腐蚀行为与机理研究 |
| Accelerated Corrosion Behavior and Mechanism of Coated Alloy Ateel by Cyclic Salt-spray Test |
| 投稿时间：2021-04-10 修订日期：2021-08-12 |
| DOI：10.16490/j.cnki.issn.1001-3660.2022.04.024 |
| 中文关键词: 含镀层合金钢 循环盐雾试验 腐蚀行为与机理 电化学测试 |
| 英文关键词:coated alloy steel cyclic salt-spray test corrosion behavior and mechanism electrochemical measurement |
| 基金项目:技术基础科研项目(JSHS2016204B002) |
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| Author | Institution |
| ZHAO Peng-fei | Aerospace Science & Industry Corp Defense Technology R&T Center, Beijing 100854, China |
| GUO Wen-ying | Aerospace Science & Industry Corp Defense Technology R&T Center, Beijing 100854, China |
| TAO Yang | Aerospace Science & Industry Corp Defense Technology R&T Center, Beijing 100854, China |
| WEN Lei | University of Science and Technology Beijing, Beijing 100083, China |
| WU Jun-sheng | University of Science and Technology Beijing, Beijing 100083, China |
| WEI Xiao-qin | Southwest Technology and Engineering Research Institute, Chongqing 400039, China |
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| 中文摘要: |
| 目的 研究含镀层合金钢在室内模拟及强化腐蚀环境下的腐蚀行为与机理，建立快速评价含镀层钢腐蚀寿命的加速试验方法。方法 利用设计的室内加速腐蚀环境试验谱，通过实施模拟海洋大气环境效应的循环盐雾加速腐蚀试验，采用外观检查、SEM、XRD及电化学测试等手段，表征了暴露不同周期样品的腐蚀失重、腐蚀形貌、腐蚀产物成分、极化曲线及阻抗谱等腐蚀性能，分析和归纳了含镀层合金钢的加速腐蚀行为和电化学机理。结果 随着腐蚀暴露时间的延长，含镀层合金钢样品的腐蚀失重动力学符合幂函数规律，腐蚀速率呈现先减小后增大再减小的变化趋势。表面形貌从镀层腐蚀产物逐渐过渡为基体金属锈层，成分从羟基氯化锌、羟基氧化锌逐渐过渡为羟基氧化铁为主。极化曲线拟合的腐蚀电流密度呈现围绕中枢值上下波动的变化趋势，腐蚀电位则呈现波动上升趋势。电化学阻抗谱的容抗弧从1个变化为2个，后期容抗弧中低频区出现的直线显示出Warburg阻抗的典型特征。结论 循环盐雾环境对含镀层合金钢腐蚀的加速效果显著，从腐蚀动力学、腐蚀产物形貌及成分、电化学机理等角度，能够比较全面地表征含镀层合金钢的加速腐蚀行为与机理，为进一步研究加速腐蚀试验的模拟性和相关性提供条件。 |
| 英文摘要: |
| 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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