Novel environmentally-friendly passivating agent

Abstract

The invention discloses a novel environmentally-friendly passivating agent, which is characterized by comprising 30 to 40 g / L of sodium silicate, 10 to 20 g / L of phosphate, 5 to 10 g / L of accelerant and 0.5 to 1 g / L of surfactant, wherein the mass ratio of the silicate to the phosphate is 2-3: 1; the accelerant is potassium chlorate; the surfactant consists of 1.8 to 2.2 weight parts of OP-10, 0.8 to 1.2 weight parts of TX-100 and 0.8 to 1.2 weight parts of NP-5; and the pH value of the mixed solution is adjusted to be between 3 and 5 by using phosphoric acid. Compared with the prior art, thepassivating agent quickly passivates the surfaces of steel parts, and does not cause environmental pollution and the like.

Description

technical field

[0001] The invention relates to a passivating agent for rapid passivation of steel. Background technique

[0002] Corrosion of steel materials occurs all the time. According to statistics, 10% of steel materials cannot be recycled due to corrosion every year. In order to prevent corrosion and reduce the huge losses caused by corrosion of steel materials, various anti-corrosion methods must be adopted, and passivation treatment of steel surfaces is one of the means. At present, there are roughly three types of passivation agents used for steel passivation treatment: chromate, molybdate and organic passivation agent. The use of chromate as a passivator is low in cost, easy to use, and good in corrosion resistance, but it is highly toxic and easy to cause cancer, and it will cause great pollution to the environment after being discharged. Use is strictly limited. Organic passivators are more expensive, and emit various pungent odors. Long-term exposure has ca...