首页> 外文会议>International Symposium on Eco-Materials Processing amp; Design; 20060108-11; Chengdu(CN) >Evaluating the Electrochemical Properties in the Protection Potential of Material for Use in Al Vessels in Seawater
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Evaluating the Electrochemical Properties in the Protection Potential of Material for Use in Al Vessels in Seawater

机译:评估用于海水中铝制容器的材料的保护电位中的电化学性质

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FRP (fiber-reinforced polymer) ships used with small boats for fishing pose numerous problems related to both the environment and recycling. From this perspective, aluminum offers an environmentally friendly substitute for FRP that is easy to recycle and imparts a high added value to fishing boats, with a reduction in fuel demands. The current density of 7075 Al alloy increases linearly with an increase in potential during anodic polarization, which implies that no passivation of this alloy occurs. With 1050 and 5456 alloys, passive films form during anodic polarization but are destroyed by the Cl~- in seawater, only to regrow as a result of the self-healing capacity of aluminum. A shift to more anodic or cathodic conditions in the potential range of -1.5 ~- 0.68 V resulted in a sudden increase in current density. Current densities in the high-strength 7075 Al alloy showed the greatest values. In contrast, the current densities of 5456 alloy, known to have excellent corrosion resistance in seawater, were the lowest in the range of-0.70 ~-1.3 V, and we conclude that this potential range offers optimal protection.
机译:与小船一起使用的FRP(纤维增强聚合物)船用于捕鱼会带来许多与环境和回收相关的问题。从这个角度来看,铝为FRP提供了一种环保替代品,它易于回收利用,并为渔船带来了高附加值,同时减少了燃料需求。 7075铝合金的电流密度在阳极极化过程中随着电势的增加而线性增加,这意味着该合金不会发生钝化。对于1050和5456合金,钝化膜会在阳极极化过程中形成,但会被海水中的Cl〜-破坏,只是由于铝的自愈能力而使其再生。在-1.5〜-0.68 V的电位范围内转移到更多的阳极或阴极条件会导致电流密度突然增加。高强度7075铝合金中的电流密度显示出最大值。相反,已知在海水中具有出色的耐腐蚀性的5456合金的电流密度在-0.70〜-1.3 V的范围内最低,我们得出结论,该电位范围提供了最佳的保护。

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