Preparation method of steel surface treatment agent before painting
A technology of steel surface and treatment agent, applied in the direction of metal material coating process, etc., can solve problems such as poor adhesion
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[0029] Embodiment The present invention provides a kind of preparation method of steel surface treatment agent before coating, comprises the following steps:
[0030] (1) Configure degreasing agent working fluid
[0031] Dissolve an appropriate amount of degreasing agent in water, and prepare a degreasing agent working fluid with a concentration of 5% for use. The degreasing working fluid is LS-207 degreasing agent.
[0032] (2) Preparation of film-forming solution
[0033] Add sodium borate with a concentration of 0-10g / L, sodium molybdate with a concentration of 0-6g / L, organic acid with a concentration of 0-6g / L and fluorozirconate with a concentration of 1-10mL / L into the water in sequence, and stir evenly. Add triethanolamine to adjust the pH, and the pH value is 4-8 to obtain a film-forming liquid.
[0034] The preparation method of the film-forming solution for fatigue measurement is to add 4g sodium borate, 3g sodium molybdate, 2g organic acid, 4mL fluorozirconate in...
Embodiment 1
[0037] Change the amount of sodium molybdate, add sodium borate with a concentration of 4g / L, sodium molybdate 0-6g / L, organic acid 2g / L and fluorozirconate 4mL / L into the water in sequence and stir uniform, add triethanolamine to adjust the pH, and the pH value is 4 to obtain a film-forming solution. Such as figure 2 As shown, when the concentration of sodium molybdate is about 3g / L, the anti-corrosion time is the longest and the film formation is the best. When the concentration of sodium molybdate is less than 3g / L, iron ions react with sodium molybdate to form molybdenum oxide and insoluble iron molybdate on the steel surface, and molybdenum oxide protects the iron sheet. In the presence of salt, when the polymolybdate is adsorbed on the hydrated iron oxide film, the potential range of the anode passivation zone is expanded, the passivation current density is reduced, the small pores are induced to passivate again, and the corrosion resistance is improved. The main reas...
Embodiment 2
[0039] Change the amount of organic acid added, add sodium borate at a concentration of 4g / L, sodium molybdate at 3g / L, organic acid at 0-6g / L and fluorozirconate at 4mL / L to the water in sequence and stir evenly , adding triethanolamine to adjust the pH, the pH value is 4, and the film-forming liquid is obtained. Such as image 3 As shown, when the concentration of organic acid is around 2g / L, the anti-corrosion time is the longest and the film formation is the best. When the concentration of organic acid is less than 2g / L, as the concentration increases, the organic acid complexes with iron ions to form organic acid iron, which deposits on the surface of the iron sheet to protect the iron sheet.
[0040] Organic acids contain carboxyl groups and are oxidizing. When the concentration is greater than 2g / L, as the concentration increases, the oxidizing property gradually strengthens, oxidizing the steel surface to form Fe 3+ , so that the complex of organic acid iron and mol...
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