航空标准紧固件镀锌层的三价铬钝化

Viation standard fasteners galvanized layer of trivalent chromium passivation

三价铬的危害远远小于六价铬,在目前产品使用中属于环保的系列。在使用三价铬钝化剂的同时,配合加入稀土金属添加剂,钝化层的耐腐蚀性能将大大提高,并且可以得到不同的彩色钝化膜,如蓝色,黑色等色彩。优点是操作条件要求相对较低,采用封闭工艺,直接在钝化液中加入封孔剂,如酸性硅溶胶,可以有效克服三价铬钝化没有自愈能力的缺点,从而能极大程度地提高涂层的耐蚀性。最后得到了具有良好耐蚀性的三价铬彩色钝化膜。

The harm of trivalent chromium far less hexavalent chromium,belongs to the series of environmental protection in the product is used currently. At the same time,in the use of trivalent chromium passivation agent cooperate join additive of rare earth metals,the corrosion resistance of passivation layer will rise greatly,and can get different colour passivation membrane,such as blue,black. Advantage is relatively low operating condition requirements,use a closed process,hole sealing agent added directly to the passivation solution,such as acidic silica sol,can effectively overcome the trivalent chromium passivation no self- healing capability shortcomings,which can drastically improve the corrosion resistance of coating. Finally got have good corrosion resistance of trivalent chromium passivation film colour.