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用电化学方法研究了Mg-Li-Al-Ca系合金在3.5%Na Cl溶液中的腐蚀行为,利用扫描电镜观察腐蚀后的表面形貌,利用X射线衍射仪分析了腐蚀产物的组成,通过失重法测试腐蚀速率。结果表明:腐蚀测试过程中出现大量的气泡和腐蚀坑,且腐蚀现象主要发生在纯镁基体和Mg Li2Al相上。在电化学测试过程中,随着Li含量的增加,腐蚀电位、腐蚀电流和腐蚀速度都经历了先升高后降低的变化,在Li含量为9%左右出现拐点。XRD分析结果表明,腐蚀产物层主要为Mg(OH)2。
The corrosion behavior of Mg-Li-Al-Ca alloy in 3.5% NaCl solution was studied electrochemically. The surface morphology of the Mg-Li-Al-Ca alloy was observed by scanning electron microscopy. The composition of the corrosion products was analyzed by X-ray diffraction Weight loss test corrosion rate. The results show that a large number of bubbles and corrosion pits occur during the corrosion test, and the corrosion mainly occurs on the pure Mg matrix and the Mg Li2Al phase. During the electrochemical test, with the increase of Li content, the corrosion potential, the corrosion current and the corrosion rate all experienced the first increase and then decrease, and the inflection point appeared at a Li content of 9%. The XRD results show that the corrosion product layer is mainly Mg (OH) 2.