陈跃良,张柱柱,姚念奎,张勇,卞贵学,黄海亮,王安东,李军亮.未渗氮和渗氮38CrMoAl钢在盐雾环境中的初期腐蚀行为[J].表面技术,2021,50(1):383-394.
CHEN Yue-liang,ZHANG Zhu-zhu,YAO Nian-kui,ZHANG Yong,BIAN Gui-xue,HUANG Hai-liang,WANG An-dong,LI Jun-liang.Initial Corrosion Behavior of Non-nitriding and Nitriding 38CrMoAl Steel in Salt Spray Environment[J].Surface Technology,2021,50(1):383-394 |
| 未渗氮和渗氮38CrMoAl钢在盐雾环境中的初期腐蚀行为 |
| Initial Corrosion Behavior of Non-nitriding and Nitriding 38CrMoAl Steel in Salt Spray Environment |
| 投稿时间：2020-06-07 修订日期：2020-08-03 |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.01.035 |
| 中文关键词: 38CrMoAl 渗氮钢 盐雾试验 微区电化学 电化学阻抗谱 腐蚀机理 |
| 英文关键词:38CrMoAl nitrided steel salt spray test microelectrochemistry electrochemical impedance spectroscopy corrosion mechanism |
| 基金项目:山东省高等学校“青创科技计划”资助项目(2020KJA014);中国博士后科学基金(2019M653929) |
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| Author | Institution |
| CHEN Yue-liang | Naval Aviation University Qingdao Campus, Qingdao 266041, China |
| ZHANG Zhu-zhu | Naval Aviation University Qingdao Campus, Qingdao 266041, China |
| YAO Nian-kui | Shengyang Aircraft Design and Reaseach Institute, Shenyang 110035, China |
| ZHANG Yong | Naval Aviation University Qingdao Campus, Qingdao 266041, China |
| BIAN Gui-xue | Naval Aviation University Qingdao Campus, Qingdao 266041, China |
| HUANG Hai-liang | Naval Aviation University Qingdao Campus, Qingdao 266041, China |
| WANG An-dong | Naval Aviation University Qingdao Campus, Qingdao 266041, China |
| LI Jun-liang | Naval Aviation University Qingdao Campus, Qingdao 266041, China |
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| 中文摘要: |
| 目的 研究未渗氮和渗氮38CrMoAl钢在模拟海洋大气环境中的初期腐蚀特征和电化学腐蚀行为。方法 通过对未渗氮和渗氮38CrMoAl钢试件进行盐雾试验来模拟其在海洋大气环境中的初期腐蚀行为，并对不同腐蚀周期后的试件进行表面形貌、腐蚀速率、FT-IR、动电位极化、电化学阻抗和微区电化学分析及研究。结果 在盐雾试验中未渗氮试件由点蚀逐渐发展为均匀腐蚀，渗氮件始终呈现局部腐蚀特征，且渗氮件的腐蚀速率小于未渗氮件的腐蚀速率。未渗氮和渗氮试件的腐蚀产物中均含有Fe3O4、α-FeOOH、γ-FeOOH和δ-FeOOH，渗氮件腐蚀产物层中γ-FeOOH的含量较低。未渗氮件的自腐蚀电流密度随腐蚀时间呈增大-减小-增大的趋势，容抗弧半径呈减小-增大-减小的趋势，腐蚀6 d时，未渗氮件的自腐蚀电流密度为147.83 µA/cm2，腐蚀反应电阻为2103.6 Ω.cm2，此时试件的腐蚀速率最低，致密的腐蚀产物层阻碍了腐蚀溶液和氧气向金属基体的扩散过程。渗氮件的自腐蚀电流密度呈增大-减小的趋势，容抗弧半径呈减小-增大的趋势，盐雾腐蚀12 d后，渗氮件的自腐蚀电流密度为35.76 µA/cm2，腐蚀反应电阻为3021.5 Ω.cm2，渗氮件腐蚀产物层对腐蚀速率的抑制作用出现得更晚。未渗氮件在盐雾腐蚀初期，表面SKP电位差迅速增大，试件表面形成了明显的阴极区和阳极区，随后电位差保持平稳，试件表面腐蚀向均匀腐蚀发展。渗氮试件表面电位分散程度更大，局部腐蚀特征更加明显。结论 未渗氮件腐蚀产物层的保护性能随厚度的增加而增加，但随着腐蚀时间的延长，腐蚀产物覆盖层不断增厚，由于内应力增加，腐蚀产物出现裂纹，使腐蚀产物层的保护性能下降。渗氮件在盐雾腐蚀初期起主要保护作用的是表面渗氮层，随着腐蚀的进行，渗氮层被逐渐侵蚀甚至出现裂纹，腐蚀产物层逐渐起主导作用。 |
| 英文摘要: |
| In order to study the initial corrosion characteristics and electrochemical corrosion behavior of as-received and nitrided 38CrMoAl steel in salt spray environment. The salt spray test was performed on the as-received and nitrided 38CrMoAl steel specimens to simulate its initial corrosion behavior in the marine atmosphere, and the surface morphology, corrosion rate, FT-IR, and FT-IR of the specimens after different corrosion cycles Potential polarization, electrochemical impedance and micro-area electrochemical analysis and research. In the salt spray test, the as-received specimens gradually developed from pitting corrosion to uniform corrosion. The nitrided parts always showed local corrosion characteristics, and the corrosion rate of the nitrided parts was less than that of the as-received parts. The corrosion products of as-received and nitrided specimens contain Fe3O4, α-FeOOH, γ-FeOOH and δ-FeOOH, and the content of γ-FeOOH in the corrosion product layer of nitrided parts is relatively low. The self-corrosion current density of as-received parts showed an increasing-decreasing-increasing trend, and the capacitance arc radius showed a decreasing-increasing-decreasing trend. When corroded for 6 days, the self-corrosion current density of as-received parts was 147.83 µA/cm2, the corrosion reaction resistance is 2103.6 Ω.cm2. At this time, the corrosion rate of the specimen is the lowest, and the dense corrosion product layer hinders the diffusion process of the corrosion solution and oxygen into the metal matrix. The self-corrosion current density of nitrided parts showed an increase-decrease trend, and the capacitance arc radius showed a decrease-increasing trend. After 12 days of salt spray corrosion, the self-corrosion current density of nitrided parts was 35.76 µA/cm2, The corrosion reaction resistance is 3021.5 Ω.cm2, and the corrosion product layer of the nitrided part appears to inhibit the corrosion rate later. In the early stage of salt spray corrosion, the SKP potential difference on the surface of the as-received piece increased rapidly, and obvious cathode areas and anode areas were formed on the surface of the test piece. Subsequently, the potential difference remained stable, and the surface corrosion of the test piece developed toward uniform corrosion. The surface potential of the nitrided test piece is more dispersed and the corrosion is more uneven. The protective performance of the corrosion product layer of as-received parts increases with the increase in thickness, but as the corrosion time increases, the corrosion product covering layer continues to thicken, and the corrosion product cracks due to the increase of internal stress, which reduces the protection performance of the corrosion product layer. The main protective role of the nitrided parts in the early stage of salt spray corrosion is the surface nitriding layer. As the corrosion progresses, the nitriding layer is gradually eroded and even cracks appear, and the corrosion product layer gradually plays a leading role. |
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