以工业生产线上失效的三价铬蓝白钝化废液为对象,通过添加某些组分来改善钝化液的性能,并延长其使用寿命.结果表明,添加Cr~(3+)能够提高钝化件的耐蚀性,添加Co~(2+)能够恢复钝化件的蓝色光泽,添加复合有机酸能改善钝化件的外观和耐蚀性,添加F-对钝化液性能的影响较小.同时添加Cr~(3+)、Co~(2+)和复合有机酸能明显改善钝化件的外观和耐蚀性,实现钝化液钝化性能的恢复.
Some components were added to a spent blue-white trivalent chromium passivation bath from industrial production line to improve its performance and extend its service life.The results showed that adding Cr~(3+) can improve corrosion resistance,adding Co2+or organic acid compound can recover blue gloss of passivation film,and adding F-has little effect on the performance of passivation bath.The simultaneous addition of Cr~(3+),Co~(2+) and organic acid compound Can apparently improve the appearance and corrosion resistance of passivation film,thus achieving the recovery of spent passivation bath.
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