DCHZ-703-4 aluminum alloy in the temperature of a blocking agent, characterized DCHZ-703-4 for sealing anodized aluminum to improve corrosion resistance of the oxide film, the closure process does not change color, reliable performance, especially for oxide staining The sealing treatment for thick sealing also has its unique advantages, using the latest national standard GB / T8753.2-2005 testing, their test results were satisfactory. Second, the process conditions DCHZ-703-4 7g / L (5 ~ 6g / L) pH 5.0 ~ 5.7 times the temperature 50 ~ 60 ℃ 10 ~ 20min (closing speed: 1μm / min) three shall be thoroughly cleaned before the closure maintenance treatment to avoid contamination of impurities into the bath, to extend bath life, to be dried after blocking treatment. DCHZ-703-4 consumption of 0.7 ~ 1.2kg / T four, sealing under normal circumstances Memo, pH value decreased, with DCHZ-703-4PH regulate water regulation. To raise the pH value, with glacial acetic acid.