赵连红,王浩伟,沈明禄,崔中雨.起落架用30CrMnSiNi2A钢表面Cd-Ti镀层在海水和盐雾环境中的腐蚀行为研究[J].表面技术,2022,51(5):214-222.
ZHAO Lian-hong,WANG Hao-wei,SHEN Ming-lu,CUI Zhong-yu.Corrosion Behavior of Cd-Ti Coating on Landing Gear Surface of 30CrMnSiNi2A Steel in Seawater and Salt Spray[J].Surface Technology,2022,51(5):214-222
起落架用30CrMnSiNi2A钢表面Cd-Ti镀层在海水和盐雾环境中的腐蚀行为研究
Corrosion Behavior of Cd-Ti Coating on Landing Gear Surface of 30CrMnSiNi2A Steel in Seawater and Salt Spray
  
DOI:10.16490/j.cnki.issn.1001-3660.2022.05.022
中文关键词:  起落架  电化学测试  Cd-Ti镀层  CdCO3  腐蚀  长周期浸泡
英文关键词:landing gear  electrochemical test  Cd-Ti coating  CdCO3  corrosion  long period soaking
基金项目:国家自然科学基金(51601182)
作者单位
赵连红 中国特种飞行器研究所,湖北 荆门 448001 
王浩伟 中国特种飞行器研究所,湖北 荆门 448001 
沈明禄 中国海洋大学 材料科学与工程学院,山东 青岛 266100 
崔中雨 中国海洋大学 材料科学与工程学院,山东 青岛 266100 
AuthorInstitution
ZHAO Lian-hong China Special Aircraft Research Institute, Hubei Jingmen 448001, China 
WANG Hao-wei China Special Aircraft Research Institute, Hubei Jingmen 448001, China 
SHEN Ming-lu School of Material Science and Engineering, Ocean University of China, Shandong Qingdao 266100, China 
CUI Zhong-yu School of Material Science and Engineering, Ocean University of China, Shandong Qingdao 266100, China 
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中文摘要:
      目的 探究水陆两栖飞机用起落架材料表面Cd-Ti镀层的环境适应性及其失效机制。方法 通过采用热轧状态的起落架用钢30CrMnSiNi2A,表面经过喷丸处理后电镀Cd-Ti,然后进行钝化处理。选取平行试样进行浸泡盐雾试验,同时对镀层在长周期浸泡下的状态进行EIS测量,在4种pH条件下进行极化曲线的测量。通过激光共聚焦显微镜测量3D轮廓。采用X射线衍射仪和扫描电子显微镜分析表面成分和形貌。通过EDS进行能谱分析。结果 在3D轮廓的测量中,Cd-Ti镀层表面粗糙度Ra=1.69 mm,镀层截面厚度约为11 mm。pH=3.0时,Cd-Ti镀层的腐蚀电位最正,腐蚀电流密度最大。Cd-Ti镀层表面主要存在Cd、CdO、Ti以及部分CdCO3和CdO2。长周期浸泡试验的EIS测试发现,随着浸泡时间的延长,Nyquist曲线发生改变,28 d后镀层表面存在一层致密的腐蚀产物膜,可以有效地阻挡腐蚀性介质进入镀层,在Nyquist图中表现为容抗弧增大。2种试验环境下的增重速率表明,在盐雾环境中,增重速率较快,这与表面生成更多的CdCO3有关。结论 Cd-Ti镀层在不同的环境中对材料都有较好的保护作用,能够在一定程度上防止基体腐蚀。
英文摘要:
      In the research of this paper, 30CrMnSiNi2A, as a commonly used landing gear steel, has to face different environments in the process of use. In the landing gear of amphibious aircraft, the service environment is even worse, and the landing gear has been eroded by spray spatter, salt and alternating dry and wet for a long time. In this paper, the assessment and evaluation system under different environments is established, the immersion and salt spray tests are used to simulate the landing gear environment, the immersion environment is used to simulate the landing gear underwater environment, and the salt fog environment is used to simulate the marine atmosphere and unsteady liquid film environment. The purpose of this paper is to explore the environmental adaptability and failure mechanism of Cd-Ti coating on the surface of landing gear materials for amphibious aircraft. By using hot rolled landing gear steel 30CrMnSiNi2A, the surface was electroplated with Cd-Ti after shot peening, and then passivated. The parallel samples were selected for salt spray test, the coating was measured by EIS under long-period immersion at the same time, and the polarization curves were measured under four kinds of pH conditions. The 3D profile was measured by laser confocal microscope, the surface composition and morphology after 14 days and 28 days after immersion and salt spray test were measured by X-ray diffractometer and scanning electron microscope, respectively, and the energy spectrum was analyzed by EDS. In the measurement of 3D profile, the surface roughness of Cd-Ti coating is Ra=1.69 mm, and the thickness of coating section is about 11 mm. In pH=3.0, the corrosion potential is the most positive and the corrosion current density is the highest. XRD test mainly contains Cd, CdO, Ti and some CdCO3 and CdO2 on its surface. When EIS measurement was carried out in long-period immersion, the Nyquist curve changed with the extension of immersion time. After 28 days, there was a dense corrosion product film on the surface, which could effectively prevent the entry of corrosive media, and the capacitance arc increased in the Nyquist diagram. The weight gain rates of the two experimental environments were measured, which showed that the weight gain rate was faster in the salt spray environment, which was related to the formation of more CdCO3 on the surface. In the salt spray environment, the material surface exists in the form of liquid film, and the supply of oxygen is sufficient, which promotes the oxygen reduction process and the formation of OH‒, a large number of OH‒ also promotes the deposition of corrosion products, and the deposition of corrosion products further adsorbs Cl‒ to make the corrosion front expand forward, which leads to the corrosion rate in the salt spray environment is higher than that in the immersion environment. With the increase of immersion time, the arc resistance radius on the EIS curve increases, the corrosion resistance of the coating becomes better, which is related to the formation of dense corrosion product film on the surface of the coating. With the increase of acidity, the protective ability of Cd-Ti coating to the substrate is weaker. The Cd-Ti coating on the surface of 30CrMnSiNi2A has a good protective effect on the material in salt spray and immersion environment, and can prevent the substrate from corrosion to a certain extent.
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