对镁-铝合金β相模型合金在不同浓度的Cl~-溶液环境中的腐蚀电化学行为进行研究.结果表明,随着Cl~-浓度的增加,β相的自腐蚀电位依次降低.但β相与α相之间的电位差没有随Cl~-浓度的增加递增.β相在不同浓度的Cl~-溶液中均能发生钝化,随Cl~-浓度的增加点蚀击破电位降低,相应表面膜中含Mg的腐蚀产物种类也增多.在不同浓度Cl~-溶液环境中,β相模型合金的腐蚀电化学结果可以揭示β相的微电偶作用. The electrochemical corrosion behavior of β-phase model alloy in different concentrations of Cl ~ - solution was studied. The results showed that the corrosion potential of β phase decreased with the increase of Cl ~ The potential difference between phase and α phase did not increase with increasing Cl ~ .Phase could be passivated in different concentrations of Cl ~ - solution. The types of corrosion products containing Mg in the surface film also increased.Under different concentrations of Cl ~ - solution environment, the corrosion electrochemistry results of β phase model alloy can reveal the micro-galvanic effect of β phase.