基于LIBS技术的镁合金盐雾腐蚀行为研究

Study on Salt Spray Corrosion Behavior of Magnesium Alloy Based on LIBS Technology

为了研究镁合金在盐雾腐蚀实验中的腐蚀行为,对盐雾腐蚀后的LA103Z型镁锂合金表面进行SEM,EDS和XRD表征,使用三维轮廓扫描仪研究激光脉冲次数与激光烧蚀深度的关系。采用激光诱导击穿光谱技术(LIBS)技术研究腐蚀元素Na和Ca,基底元素Mg和Al在纵向的相对分布。结果表明,合金表面形成了Mg(OH)_(2),Al_(2)O_(3)和Li_(2)CO_(3)等腐蚀产物。96 h腐蚀时间下样品中Na和Ca的腐蚀深度分别约为24.48μm和13.6μm。同时,发现Na和Ca参与反应生成腐蚀产物NaAlCO_(3)(OH)_(2)和CaAl_(2)O_(4)。

In order to investigate the corrosion behavior of Magnesium alloy in salt spray corrosion experiments,the LA103Z Magnesium-lithium alloy was characterized by SEM,EDS and XRD after salt spray corrosion experiments,the relationship between the number of laser pulses and the depth of laser ablation was investigated by a 3D profile scanner.The relative content distribution of Na,Ca corrosive elements and Mg,Al substrate elements at longitudinal depth were investigated by laser induced breakdown spectroscopy(LIBS)technique.The results showed that corrosion products such as Mg(OH)_(2),Al_(2)O_(3)and Li_(2)CO_(3)were formed on the alloy surface.The corrosion depths of Na and Ca in the samples at 96 h were about 24.48μm,13.6μm respectively.Meanwhile,Na and Ca were found to be involved in the reaction to generate corrosion products NaAlCO_(3)(OH)_(2)and CaAl_(2)O_(4).