Corrosion Resistance and Bonding Force of Silane-Lanthanum Salt Composite Film on 6061 Aluminum Alloy Surface
The effect of lanthanum nitrate on corrosion resistance of γ-aminopropyl-trimethoxysilane (KH-550) film on the surface of 6061 aluminum alloy was studied by means of polarization curve and copper sulfate solution dripping test.The bonding force between the sample (composite film,blank sample,silane film sample,lanthanum salt pasaivation film sample) and the organic coating was researched through the full immersion corrosion test.Results showed that adding of a certain amount of lanthanum nitrate in the preparation of KH-550 silane film could effectively improve the corrosion resistance and adhesion of silane films.Moreover,the composite film coating was uniform and dense.At the same time,the corrosion inhibition mechanism of the composite coating was studied preliminarily.
silane-lanthanum salt composite film6061 aluminum alloysfull immersion testcorrosion inhibition mechanismbonding force
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