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The conversion coating was formed by dipping AA6061 in a fluorotitanate/zirconate acid and amino trimethylene phosphonic acid(ATMP)solution at room temperature. The formation process and the anti-corrosion performance of the conversion coating were investigated using electrochemical test and salt spray test(SST),respectively. The electrochemical test shows that the Zr/Ti and ATMP coating improves the cor- rosion resistance of AA6061 as good as the chromate(Ⅵ)coating.But the results of SST show that the corrosion resistance of Zr/Ti and ATMP coating is not as good as the chromate(Ⅵ)coating.The corrosion area is less than 2% after 72 h.
The conversion process was formed by dipping AA6061 in a fluorotitanate / zirconate acid and amino trimethylene phosphonic acid (ATMP) solution at room temperature. The formation process and the anti-corrosion performance of the conversion coating were investigated using electrochemical test and salt spray test ( SST), respectively. The electrochemical test shows that the Zr / Ti and ATMP coating improves the cor- rosion resistance of AA6061 as good as the chromate (VI) coating. But the results of SST show that the corrosion resistance of Zr / Ti and ATMP coating is not as good as the chromate (VI) coating. The corrosion area is less than 2% after 72 h.