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采用电化学方法研究了5083铝合金在海水中的腐蚀行为,考察了Cl-浓度对其点蚀行为的影响。结果表明,5083铝合金在海水中的点蚀击破电位为-690 m V,相对应的点蚀保护电位为-720 m V。Cl-是诱发5083铝合金发生点蚀的活性离子,对于同离子强度的溶液,Cl-含量在0~0.1 mol/kg时,点蚀击破电位随Cl-含量的升高快速下降,Cl-含量超过0.1 mol/kg时,点蚀击破电位不再发生明显变化。在此基础上,通过极化实验确定了5083铝合金在海水中适用的阴极保护电位范围为-800~-1000 m V。
The corrosion behavior of 5083 aluminum alloy in seawater was investigated by electrochemical method and the effect of Cl- concentration on its pitting behavior was investigated. The results show that the pitting corrosion potential of 5083 aluminum alloy in seawater is -690 mV, and the corresponding pitting corrosion potential is -720 mV. Cl- is the active ion inducing pitting corrosion in 5083 aluminum alloy. For the solution with the same ionic strength, the pitting breakdown potential decreases rapidly with the Cl- content at 0 ~ 0.1 mol / kg, Cl- content Over 0.1 mol / kg, pitting rupture potential no longer significant changes. Based on this, the suitable cathodic protection potential of 5083 aluminum alloy in seawater was determined from the polarization experiment to be -800 ~ -1000 mV.