铝合金在海水中的耐蚀性与腐蚀电位的关系

依据铝合金在青岛海域的暴露腐蚀结果和腐蚀电位数据,讨论了铝合金在海水中的耐蚀性与腐蚀电位的关系.结果表明,耐海水腐蚀性能相似的铝合金,其海水腐蚀电位-时间曲线的形状、特性也相似.耐海水腐蚀性能较好的铝合金,其初始电位、稳定电位均较负,达到稳定的时间较长、稳定电位波动较大.耐蚀性较差的铝合金则相反.

RELATIONSHIP BETWEEN CORROSION RESISTANCE AND CORROSION POTENTIAL OF ALUMINIUM ALLOYS IN SEAWATER

On the basis of corrosion data and corrosion potentials of aluminium alloys exposed to seawater at Qingdao area, the relationship between corrosion resistance and corrosion potentials of aluminium alloys was discussed. Seawater Corrosion resistance of LY12CZ and LC4CS alloys was very poor, and it was also poor for LD2CS, L4M and LF3M alloys. LF2Y2, LF6M, LF21M and 180YS alloys had good corrosion resistance in seawater. The aluminium alloys with similar corosion resistance had a similar pattern for their corrosion potential time curves. The aluminium alloys that had good corrosion resistance all possessed relativily negative initial and then stable potential. Meanwhile, they took longer time to reach stability. When stability reached, their potentials were fluctuating for a longer time. The alloys which have poor corrosion resistance showed an oppsite situation.