厦门海域海水对铝镁合金腐蚀的苛刻性及其电化学机理

Severe Corrosivity and Its Eletrochemical Mechanism of Seawater in Xiamen Sea Area to Al-Mg Alloys

我国不同的海域的表层海水对铝合金显示出不同的腐蚀性 ,其中 ,以厦门海域海水对铝镁合金的腐蚀最为苛刻 ,而青岛海域海水则对铝镁合金的腐蚀性最为温和 .原因即在厦门海域海水的特殊盐度以及由此产生的“电解质”效应 .文中给出了典型铝镁合金在青岛 ,厦门 ,榆林各海域全浸 ,潮差 ,飞溅区暴露 1 6a(年 )的腐蚀数据和腐蚀形貌 ,进一步证实了“电解质”

The surface layer seawater of different sea areas in China exhibit different corrosivity to Al_Mg alloys according to the experiment results of 16 years exposure in seawater.The seawater in Xiamen sea area possesses severe corrosivity while seawater in Qingdao possesses the mildest corrosivity to Al_Mg alloys with better regularity of corrosion behavior.The present paper illustrates by experiment data that the strongest corrosivity of Xiamen seawater to Al_Mg alloys is owing to the low salinity of the seawater and the “electrolyte effect” come from it.The 16 year corrosion data and corrosion morphology of the typical Al_Mg alloys from full_immersion zone,tide zone and splashing zone exposure in various sea areas verified the universality of existence of the “electrolyte effect” in process of marine corrosion.