CAJ | 학술논문

采用声发射技术和电化学噪声技术研究了304控氮不锈钢C型环试样在0.5 mol·L~(-1) NaCl与 1.5 mol·L~(-1) H_2SO_4的混合溶液中,恒载荷情况下的腐蚀过程.分析了腐蚀过程中所产生的声发射信号的振铃数随时间分布情况,以及不同阶段的声发射信号的频谱特征.同时对比分析了声发射检测结果与电化学噪声检测结果.结果表明,声发射检测技术对于304控氮不锈钢在酸性NaCl溶液中所产生的腐蚀声发射信号很敏感,在不同腐蚀阶段中,声发射信号特征差异明显,对于判断不同腐蚀阶段具有指导意义;声发射与电化学噪声测试结果基本一致,将声发射检测与电化学噪声检测结合使用,有助于使现场检测结果更加可靠.
채용성발사기술화전화학조성기술연구료304공담불수강C형배시양재0.5 mol·L~(-1) NaCl여 1.5 mol·L~(-1) H_2SO_4적혼합용액중,항재하정황하적부식과정.분석료부식과정중소산생적성발사신호적진령수수시간분포정황,이급불동계단적성발사신호적빈보특정.동시대비분석료성발사검측결과여전화학조성검측결과.결과표명,성발사검측기술대우304공담불수강재산성NaCl용액중소산생적부식성발사신호흔민감,재불동부식계단중,성발사신호특정차이명현,대우판단불동부식계단구유지도의의;성발사여전화학조성측시결과기본일치,장성발사검측여전화학조성검측결합사용,유조우사현장검측결과경가가고.
The corrosion behavior of 304 nitrogen controlled stainless steel C-ring specimen with constant load in acidic NaCl solution is studied using acoustic emission(AE)and electrochemical noise(EN)techniques.The solution contains 0.5 mol·L~(-1) NaCl and 1.5 mol·L~(-1) H_2SO_4.The ring-down count feature of each AE signal generated during the corrosion process is extracted.By analyzing the ring-down count distribution as a function of time,it is found that the ring-down counts are significantly different in different corrosion stage,which may be used to estimate different stages of corrosion process.The frequency spectrum of AE signal at each main stage is analyzed.The stress corrosion cracking(SCC)of specimen is detected by using AE and EN techniques and the acquired data are compared.The result shows that AE technique is very sensitive to the AE signals generated by 304 nitrogen controlled stainless steel in acidic NaCl solution,so that the corrosion can be detected effectively.The test result of AE is consistent with that of EN,and the combination of AE and EN techniques makes the on-site testing more reliable.