5083铝合金与2205不锈钢在天然海水中的电偶腐蚀行为

研究了5083铝合金与2205不锈钢在不同面积比条件下青岛天然海水环境中的电偶腐蚀行为,得到了电偶混合电位和电偶电流。结果表明,2205不锈钢与5083铝合金形成电偶时,由于自腐蚀电位的差值较大,容易造成明显的电偶腐蚀。无论阴阳极面积相等还是在大阴极小阳极的情况下,5083铝合金与2205不锈钢均形成电偶腐蚀,都会加速5083铝合金的腐蚀,2205不锈钢则会受到保护。因此,在海水环境中要避免这两种材料的直接接触,必须采取绝缘防护措施。

Galvanic Corrosion Behavior Between 5083 Aluminium Alloy and 2205 Stainless Ateel

The galvanic potential and current between 5083 aluminium alloy and 2205 stainless steel in seawater of Qingdao offshore were studied.The results showed that due to the big potential difference,an obvious galvanic corrosion between these two types of materials in natural seawater occured.Whether the surface area of 5083 Al alloy was small or not,its corrosion rate was accelerated,at the same time the 2205 steel was protected.So,it should be avoided for these two materials to contact directly in seawater.