Corrosion-resistant aluminum pipe with aluminum corrosion, aluminum alloy depends on the degree of corrosion resistance in different environments of the stability of the oxide film. In the dry atmosphere, the passive film is not easily destroyed, is stable. Long-term exposure to outdoor atmospheric environment, local pitting occurs. This is mainly due to the deposition of dust ions on the surface, the dust ions in the water film under the metal surface of the anoxic area, leading to passive film damage and self-passivation ability caused by the decline. In the industrial atmosphere, the protective film is easy to be damaged and the corrosion resistance is decreased, especially the corrosion resistance of sulfur oxides in acid rain contaminated areas is more obvious. Aluminum front generally black, white or gray clouds of dense black spots. In the oceanic atmosphere, CL-on passive film has a strong destructive effect.
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Corrosion of aluminum in the water passivation is unstable, local corrosion is the main form of corrosion. Common localized corrosion is pitting and crevice corrosion. Pure aluminum does not produce intergranular corrosion, aluminum alloy has a large intergranular corrosion sensitivity. Stress corrosion mainly occurs in the heat treatment of high strength aluminum alloy, and are along the intergranular cracking type.
Corrosion-resistant aluminum coil in contact with most metals in seawater, showed anodic, aluminum corrosion will accelerate. Aluminum alloy also said that the immersion area of the most corrosive, splash area of the lightest, tidal zone center. In all-immersion or tidal zone, the surface of the sea fouling than other metals to be serious, which will exacerbate the local corrosion of aluminum alloy.
In the industrial environment, the average corrosion rate of aluminum corrosion for 20 years about 1μm / a. In different corrosive environment, the average pitting degree of 20 years of aluminum alloy is much more serious, the data are as follows: rural environment 10 - 55μm; urban environment 100 - 190μm; marine environment 85 - 260μm.
Aluminum and steel, copper and stainless steel and other metals in contact, the risk of galvanic corrosion. Therefore, aluminum and these metals to be insulated from each other.
Corrosion-resistant aluminum coil containing 4.5% magnesium and 1% manganese, known as sea water resistant aluminum alloy, in the marine environment has a very good corrosion resistance. This anti-corrosion aluminum coil for non-cuprous oxide antifouling paint. Because the antifouling paint with copper oxide as the main antifouling agent is in contact with the aluminum alloy hull, the corrosion of the hull will be caused by the galvanic effect.
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