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模拟7B04铝合金表面涂层破损,采用电化学试验研究7B04铝合金在不同环境条件下的自腐蚀与点蚀行为,基于电偶腐蚀数学模型,通过有限元法分析7B04铝合金与TA15钛合金接触后发生点蚀的条件。结果表明:7B04铝合金点蚀电位受Cl~-浓度和pH值的影响,在NaCl质量分数>10%的中性溶液及NaCl质量分数为3.5%的酸性溶液中,自腐蚀状态下7B04铝合金即可发生点蚀;7B04铝合金与TA15钛合金接触后,电位升高,增加了发生点蚀的可能性,在NaCl质量分数为3.5%的中性溶液中,当阴阳极面积比≥40时,7B04铝合金发生点蚀的萌生并进一步扩展;7B04铝合金电位随阴阳极距离的增大而下降,但幅度有限,在10 m的距离内下降不超过2 m V。
The corrosion of 7B04 aluminum alloy under different environmental conditions was studied by means of electrochemical tests. The galvanic corrosion behavior of 7B04 aluminum alloy and TA15 titanium alloy were analyzed by finite element method After pitting conditions. The results show that the pitting potential of 7B04 aluminum alloy is affected by Cl ~ - concentration and pH value. In neutral solution with NaCl> 10% and acid solution with NaCl = 3.5%, the corrosion resistance of 7B04 aluminum alloy Pitting corrosion can occur; 7B04 aluminum alloy and TA15 titanium alloy contacts, the potential increases, increasing the possibility of pitting occurs in the NaCl mass fraction of 3.5% neutral solution, when the anode area ratio ≥ 40 , 7B04 aluminum alloy occurred pitting and further expansion; 7B04 aluminum alloy potential with the anode and cathode distance decreased, but the magnitude is limited, within 10 m distance does not drop more than 2 mV.