| 钱昂,杨晓华,金平,谭晓明,王德.Cl-作用下AerMet100钢在盐雾环境中的微区电化学行为[J].装备环境工程,2019,16(10):88-94. QIAN Ang,YANG Xiao-hua,JIN Ping,TAN Xiao-ming,WANG De.Micro-zone Electrochemical Behavior of AerMet100 Steel in Salt Spray Environment under Cl-[J].Equipment Environmental Engineering,2019,16(10):88-94. |
| Cl-作用下AerMet100钢在盐雾环境中的微区电化学行为 |
| Micro-zone Electrochemical Behavior of AerMet100 Steel in Salt Spray Environment under Cl- |
| 投稿时间：2019-04-14 修订日期：2019-05-19 |
| DOI：10.7643/issn.1672-9242.2019.10.015 |
| 中文关键词: AerMet100钢 盐雾试验 微区电化学测试 腐蚀形貌 腐蚀产物 扫描开尔文探针 |
| 英文关键词:AerMet100 steel salt spray experiment micro-zone electrochemical test corrosion morphology corrosion products scanning Kelvin probe |
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| Author | Institution |
| QIAN Ang | Naval Aviation University Qingdao Campus, Qingdao 266041, China |
| YANG Xiao-hua | Naval Aviation University Qingdao Campus, Qingdao 266041, China |
| JIN Ping | Naval Aviation University Qingdao Campus, Qingdao 266041, China |
| TAN Xiao-ming | Naval Aviation University Qingdao Campus, Qingdao 266041, China |
| WANG De | Naval Aviation University Qingdao Campus, Qingdao 266041, China |
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| 中文摘要: |
| 目的 对Cl-作用下AerMet100钢在盐雾环境中的腐蚀和微区电化学行为进行研究。方法 通过开展盐雾腐蚀试验，对AerMet100钢的腐蚀形貌和腐蚀产物进行研究分析。盐雾试验不同时间后，通过SKP测试，得到试样的表面电位分布，通过Gauss拟合，对试样表面扫描开尔文电位的分布和变化情况进行分析。结果 AerMet100钢在盐雾腐蚀试验过程中的腐蚀行为从点蚀开始，逐渐发展为均匀腐蚀。腐蚀产物分为内外两层，外层疏松，内层致密。由于腐蚀反应过程中生成大量铁的氧化物及羟基氧化物，因此，内外层腐蚀产物中含有大量的Fe、O元素；内外锈层中均含有少量的Cl元素，表明Cl-参与了腐蚀反应过程；内外锈层中Cr、Co、Ni等合金元素的存在，使得锈层具有离子选择性、致密性，加速了锈层的产生。未腐蚀的试样表面电位分布比较均匀，集中程度较高，即电位差较小，总体电位差为152 mV，有少量表面活性点随机分布，此时试样表面阴极和阳极分布不规则。盐雾试验3天后，试样表面电位正移，分布趋于分散，电位差增大，总体电位差为270 mV，产生较为明显的阴极区和阳极区，由于吸附在试样表面活性点附近的Cl-破坏了表面的氧化膜，腐蚀情况逐渐发生。盐雾试验6天后，试样表面电位进一步升高，分布更为分散，电位差略有减小，总体电位差为180 mV，由于腐蚀产物层的不断扩展，试样表面已经分为明显的较大面积的阴极区和阳极区。结论 Cl-的侵蚀作用破坏了基体表面的氧化膜，使得AerMet100钢的腐蚀在夹杂物处发生。腐蚀产物能够阻碍Cl-的渗透，对基体具有保护作用。 |
| 英文摘要: |
| Objective To research on the corrosion and micro-zone electrochemical behavior of AerMet100 steel under Cl-action in salt spray environment. Methods The corrosion morphology and corrosion products of AerMet100 steel were researched and analyzed through salt spray corrosion test. After the salt spray test of different duration, the potential distribution of the sample surface was obtained through the SKP test; the distribution of Kelvin potential on the sample surface was scanned and its changes were analyzed by Gauss fitting. Results The corrosion behavior of AerMet100 steel in salt spray corrosion test started from pitting corrosion and gradually developed to uniform corrosion; the corrosion products of AerMet100 steel were divided into two layers:loose outer layer and dense inner layer; due to the formation of large amounts of iron oxides and hydroxyl oxides during the corrosion reaction, the inner and outer corrosion products contained a large number of Fe and O elements. Both the inner and outer rust layers contained a small amount of Cl-, indicating that Cl-participated in the corrosion reaction process. The presence of alloying elements such as Cr, Co and Ni in the inner and outer rust layers made the rust layer ion-selective and dense, and accelerated the generation of the rust layer. The potential distribution on the un-corroded sample surface was relatively uniform and highly concentrated, which meant that the potential difference was small. The overall potential difference was 152 mV; and a small amount of surface active points were randomly distributed. At this time, the cathode and anode distribution of the sample surface were irregular. After 3 days of the salt spray test, the potential of the sample surface was positively shifted; the distribution tended to be dispersed; the potential difference was increased; and the overall potential difference was 270 mV, resulting in obvious cathode area and anode area. Corrosion occurred gradually because the Cl- adsorbed near the surface activity point of the sample destroyed the oxide film on the surface. After 6 days of salt spray test, the potential of the sample surface was further increased; the distribution was more dispersed; the potential difference was slightly reduced; and the overall potential difference was 180 mV. Due to the continuous expansion of the corrosion product layer, the sample surface was significantly divided into larger cathode and anode areas. Conclusion The corrosiveness of C- destroys the oxide film on the surface of the matrix, causing the corrosion of AerMet100 steel at the inclusions. Corrosion products can hinder the penetration of Cl- and have a protective effect on the matrix. |
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