CAJ | 학술논문

采用电化学噪声理论,研究锌合金(ZnAl4Cu1)在3.5％(质量分数)NaCl,7.3％(质量分数)Na2SO4和模拟酸雨溶液中干湿循环条件下的腐蚀行为.采用快速傅里叶变换(FFT)、快速小波变换(FWT)和散粒噪声理论结合统计方法分析原位电化学电位噪声.散粒噪声分析的fn累计曲线图表明,在干循环中电子转移事件的频率高于湿循环中的,在NaCl溶液中的腐蚀比在Na2SO4中的腐蚀更均匀,腐蚀事件的条件产生速率r(t)对于受扩散控制的事件来说随着干湿循环时间的延长而降低.锌合金在NaCl溶液中湿循环时,均匀腐蚀和扩散控制的事件的r(t)值最大；在Na2SO4溶液中湿循环时,点蚀事件的r(t)值最大.在酸雨溶液中可明显观察到锌合金的晶间腐蚀.
채용전화학조성이론,연구자합금(ZnAl4Cu1)재3.5％(질량분수)NaCl,7.3％(질량분수)Na2SO4화모의산우용액중간습순배조건하적부식행위.채용쾌속부리협변환(FFT)、쾌속소파변환(FWT)화산립조성이론결합통계방법분석원위전화학전위조성.산립조성분석적fn루계곡선도표명,재간순배중전자전이사건적빈솔고우습순배중적,재NaCl용액중적부식비재Na2SO4중적부식경균균,부식사건적조건산생속솔r(t)대우수확산공제적사건래설수착간습순배시간적연장이강저.자합금재NaCl용액중습순배시,균균부식화확산공제적사건적r(t)치최대；재Na2SO4용액중습순배시,점식사건적r(t)치최대.재산우용액중가명현관찰도자합금적정간부식.
The corrosion behaviors of zinc alloy (ZnAl4Cu1) in 3.5％ (mass fraction) NaCl,7.3％ (mass fraction) Na2SO4 and simulated acid rain solutions were investigated using electrochemical measurements.The potential noise during dry-wet cycle was monitored and analyzed by fast Fourier transform (FFT),fast wavelet transform (FWT),shot noise theory and stochastic theory.Cumulative probability curves of event frequency fn indicate that the corrosion events in the dry cycles are greater than those in the wet cycles.Uniform corrosion was observed in the NaC1 solution compared with more localized corrosion in the Na2SO4 solution,which is evidenced by FWT and SEM.Conditional events generation rate r(t) for diffusion controlled reactions decreases with increasing the time.r(t) values for uniform corrosion and diffusion controlled process are the largest in the wet cycle in 3.5％ NaCl solution.The values of r(t) for pitting corrosion in Na2SO4 solution are observed to become large during spraying periods,and r(t) for pitting corrosion has the largest value in the Na2SO4 solution.The intergranular corrosion of zinc is serious in simulated acid rain solution.