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通过在20CrMo钢试样上喷涂有机硅改性聚脲涂层,用粘结力测试仪和显微硬度计对涂层的粘结力和硬度进行测试,采用恒温井液浸泡试验和高温高压腐蚀试验测试了涂层的耐蚀性能,结合扫描电镜(SEM)观察腐蚀形貌,并计算腐蚀速率,采用慢应变速率拉伸试验(SSRT)对涂层抗应力腐蚀性能进行分析。结果表明:腐蚀后涂层与基体宏观附着良好,能有效阻止腐蚀溶液的渗透和侵蚀;20CrMo钢经过喷涂聚脲处理后,腐蚀速率减小了一个数量级,耐蚀性能提高;应力腐蚀条件下,喷涂聚脲试样的应变量和最大应力值比基体分别增加了22%和2.7%,断裂时间延长约6.5 h,延长了基材的使用寿命。
By coating 20CrMo steel samples with silicone-modified polyurea coating, using a bond tester and a micro-hardness tester to test the adhesion and hardness of the coating, a constant-temperature well-liquid immersion test and a high-temperature high-pressure corrosion The corrosion resistance of the coating was tested. The corrosion morphology was observed by scanning electron microscopy (SEM) and the corrosion rate was calculated. The anti-stress corrosion resistance of the coating was analyzed by the slow strain rate tensile test (SSRT). The results show that the corrosion-resistant coating has a good macro-adhesion with the matrix and can effectively prevent the infiltration and erosion of the corrosion solution. The corrosion rate of 20CrMo steel decreases by one order of magnitude after spraying polyurea and the corrosion resistance improves. Under stress corrosion conditions, The amount of strain and maximum stress of the sprayed polyurea samples increased by 22% and 2.7% respectively compared with that of the matrix, and the fracture time was prolonged by 6.5 h, which prolongs the service life of the substrate.