目的 研究0359铝合金的腐蚀行为，对其腐蚀使用寿命进行预测。方法 采用盐雾实验模拟海洋大气环境，对腐蚀试样进行SEM、EDS、腐蚀深度、腐蚀失重、极化曲线和阻抗分析。结果 0359铝合金在盐雾腐蚀实验的条件下，腐蚀产物主要含O、Al、Si。随腐蚀时间延长，腐蚀点增多，腐蚀产物增多，且部分溶解脱落，腐蚀失重增加，腐蚀坑增大、加深。腐蚀时间由8 h逐渐增加至72 h，自腐蚀电位由?852.859 mV负移至?966.046 mV，腐蚀电流密度由0.346 μA/cm2增大至3.971 μA/cm2，腐蚀阻抗降低，腐蚀速率增加。腐蚀96 h时，自腐蚀电位正移，腐蚀电流密度减小，腐蚀阻抗增加，腐蚀速率降低。0359铝合金腐蚀失重-时间拟合曲线为y1=0.1927t0.6997，LC4铝合金在万宁地区户外暴露10年的腐蚀拟合失重为3.2629 g/m2，此时，0359铝合金户外腐蚀10年的当量腐蚀深度为43.80 μm，为翘片厚度的17.52%。结论 0359铝合金腐蚀形貌表现为点蚀，Al发生了吸氧腐蚀。腐蚀初期，0359铝合金表面的钝化膜阻碍了腐蚀，随腐蚀时间增加，钝化膜逐渐被破坏，腐蚀速率增加；腐蚀后期，大量腐蚀产物覆盖，阻碍了O、Cl?与铝合金的接触，降低了腐蚀速率。0359铝合金表面钝化膜和腐蚀产物具有减缓腐蚀的作用，且0359铝合金满足10年以上使用寿命。

The work aims to study corrosion behavior of 0359 aluminum alloy, and predict its corrosion service life. Salt spray test was performed to simulate marine atmosphere. SEM, EDS, corrosion depth, corrosion weight loss, polarization curve and impedance of corrosive sample were analyzed. Under the condition of salt fog corrosion experiment, corrosion products mainly included O, Al and Si. With the extension of corrosion time, corrosion points and corrosion products increased, some corrosion products dissolved and fell off, corrosion weight loss increased, and corrosion pits largened and deepened. When corrosion time increased from 8 h to 72 h, corrosion potential moved from ?852.859 mV to ?966.046 mV negatively, corrosion current density increased from 0.346 μA/cm2 to 3.971 μA/cm2, corrosion impedance reduced and corrosion rate increased. When the corrosion time was 96 h, corrosion potential moved positively, corrosion current density decreased, corrosion impedance increased and corrosion rate decreased. Corrosion weight loss-time fitting curve of 0359 alloy was y1=0.1927t0.6997, and fitting corrosion weight loss of LC4 aluminum was 3.2629 g/m2 during 10 years of outdoor exposure in Wanning. Equivalent corrosion depth of 0359 aluminum alloy was 43.80 μm during 10 years of outdoor exposure, which accounted for 17.52% of slice thickness. Corrosion morphology of 0359 aluminum alloy is pitting, and Al is subject to oxygen-consuming corrosion. At the beginning of corrosion, passive film on the surface of 0359 aluminum alloy prevents corrosion. With the extension of corrosion time, passive film is gradually destroyed, and corrosion rate increases. At later stage of corrosion, the sample is covered by a lot of corrosion products, thus hindering contact between O and Cl? with aluminum alloy and reducing corrosion rate. Passive film and corrosion products on the 0359 aluminum alloy slow down corrosion, and the service of 0359 aluminum alloy is over 10 years.