Email:jessy@jshengda.comWuxi Hengda Liquid-Purification Chemical Plant

Wuxi Hengda Liquid-Purification Chemical Plant

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Stainless Steel Pickling And Passivation Liquid Have A Strong Role In Adhesion, Auxiliary Anti-corrosion Effect

The effect of Stainless Steel Pickling and Passivation Liquid  - Stainless Steel Pickling and Passivation Liquid 

Can effectively improve the metal surface corrosion resistance, extend the service life of the workpiece.

The third generation of passivation in addition to the succession of the second generation of passivation with trivalent chromium and acid, but also increased the composition of silicon, usually by adding wet colloidal silica, its main role in the following aspects :

(1) to improve the adhesion of the passivation film. Silica is added to the Stainless Steel Pickling and Passivation Liquid  to form a colloidal solution. After applying to the galvanized sheet and dried, the Stainless Steel Pickling and Passivation Liquid  is cured into a gel and has a strong adhesion to the galvanized sheet.

(2) to keep hexavalent chromium. Silica can agglomerate hexavalent chromium in its gel, delaying the rate of hexavalent chromium loss and prolonging the time it takes for self-healing.

(3) play a secondary anti-corrosion effect. Silica gel formed by the gel itself has a certain degree of isolation to prevent the external moisture and gas into the galvanized layer surface, play a role in auxiliary anti-corrosion.

(4) to improve the product coating performance. Silica is present in the gel as polar particles, so that it can also act as a medium in addition to the other components of the passivation layer adsorbed on the surface of the galvanized sheet and can be coated with the passivation layer Layer tightly combined, change the passivation of the galvanized sheet can not be painted the lack of coating, so that after the passivation of the galvanized sheet can not only continue to paint, and coating performance better. In fact, the addition of silica after the Stainless Steel Pickling and Passivation Liquid  is closer to the composition of the color coat pretreatment liquid. So passivated products can be used directly, but also as a color coated substrate.

(5) to improve the fingerprint resistance of the product. After adding silica, the role of silica gel after the passivation of the product surface passivation film is more uniform, forming a very light very uniform light yellow, even if the amount of fingerprint adsorption is not easy to be perceived, so in general In the case of visual inspection, the fingerprint resistance of the product is improved.

(6) silica and phosphoric acid play a complementary role. The role of silica and phosphoric acid should be said to be the opposite, the silica is polar, phosphoric acid is non-polar, phosphoric acid is a reactive type of additives, silica is attached to the additive. But the two are not mutually exclusive, will not weaken the other side of the role, but learn from each other. The combination of the results of the product appearance, corrosion resistance, coating are at a better level, one of the two are better than the use of both.

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