What you need when passivating and brightening electroplated zinc workpieces
What you need when passivating and brightening electroplated zinc workpieces
Author: Robby
After galvanizing the product 2% nitric acid out of the light, immersion blue and white passivation solution passivation, cleaning hot water washing, wrestling (baking) dry.
Market blue and white passivator ready-made products can be purchased. Such as Hangzhou Oriental Surface Technology Co., Ltd. hexavalent chromium passivate P-Z2 trivalent chromium passivate P-Z10. preparation:
(1) hexavalent chromium passivation solution P-Z25g / l, reagent nitric acid 20ml / l, time 5-10 seconds;
(2) trivalent chromium passivation solution P-Z10 50ml / l pH = 2 or so, 10 - 30 seconds. 30 seconds.
The cost of hexavalent chromium passivation is lower than trivalent chromium passivation, but the lanthanate and anticorrosion are not as good as trivalent chromium passivation.