A chromium-free environmental protection aluminum surface treatment
technology was developed by theoretical analysis and a large number of
experiments. Add zirconium ions and cerium ions to the treatment solution,
besides adding fluoride, aluminum and hydrogen peroxide, etc. According to the orthogonal
test obtained a non-chromate film-formation process of environmental friendly
aluminum. The characterization methods including SEM, XPS and XRD were applied
to study and analyze the morphology, composition, phase, and corrosion
resistance of phosphate film, then discussed the film-forming reaction
mechanism. Results showed that chemical conversion film formed on the aluminum
surface was uniform, compact and stronger anti-corrosion could replace the
traditional, more toxic chromate conversion film.
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