随着防锈铝和碳纤维复合材料在航空航天工业的广泛应用,它们间的接触不可避免.当有腐蚀介质存在时,二者之间由于电极电位差的存在会发生电偶腐蚀.本工作研究了体系温度(0 ℃、10 ℃、30 ℃、60 ℃、80 ℃)和电解液中氯化钠质量浓度(1%、3.5%、7%、10%、14%)对试样电偶腐蚀情况的影响.利用SEM和EDS分析腐蚀前后的表面形貌和成分的变化.试验发现随着体系温度的升降或电解液浓度的增减,电偶腐蚀电流呈规律性变化.LB733防锈铝合金存在较大的电偶腐蚀风险,需要采取相应的保护措施后才能使用.

Upon wide application of corrosion-resisting aluminum alloy and carbon fiber composite to aerospace industry,the contact between them is inevitable.In the presence of corrosive medium,the galvanic corrosion will occur because of the potential difference between them.The effects of the system temperature(0 ℃,10 ℃,30 ℃,60 ℃,80 ℃)and the concentration of sodium chloride in electrolyte(1%,3.5%,7%, 10%,14%)on galvanic corrosion were studied.The corrosion morphology and composition were examined by SEM and EDS.It was found that the galvanic corrosion current changed with the variation of the system temperature or the electrolyte concentration.There is serious galvanic corrosion risk for corrosion-resisting aluminum alloy LB 733 which needs to be protected by appropriate galvanic corrosion control methods.