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1 概述 铝及铝合金是最常用的金属材料之一,而且其应用范围还在不断扩大之中。为了充分发挥铝合金材料的优点,人们重视对铝合金的涂装防护。 有机涂膜都是半渗透性物质,腐蚀性物质仍可不同程度地渗透进去,特别是当铝基材表面无人工转化膜的条件下,腐蚀性物质的渗入很快会使基材腐蚀。这种腐蚀主要是电化学腐蚀,阴极区的pH可超过12.5,而阳极区的pH可降到1,在这种情况下,铝基体及
1 Overview Aluminum and aluminum alloy is one of the most commonly used metallic materials, and its range of applications is still expanding. In order to give full play to the advantages of aluminum alloy materials, people attach importance to the protection of aluminum coating. Organic coatings are semi-permeable material, corrosive substances can still penetrate into different degrees, especially when the surface of aluminum substrate without artificial conversion of the film, the corrosive substances infiltration will soon make the substrate corrosion. This corrosion is mainly electrochemical corrosion, the pH of the cathode region may exceed 12.5, and the pH of the anode region may drop to 1, in which case the aluminum matrix and