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Phosphating film passivation process

A phosphating film and process technology, applied in the direction of metal material coating process and other directions, can solve problems such as the inability to meet automotive phosphating standards, and achieve the effects of saving production costs, improving corrosion resistance, and improving corrosion resistance.

Pending Publication Date: 2022-04-12
鹰普航空科技(南通)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its passivation process and potion cannot meet the phosphating standards of the automotive industry

Method used

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  • Phosphating film passivation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Pre-degreasing and degreasing adopt hot-dipping degreasing, hot-dipping degreasing is prepared by mixing degreasing powder and sodium hydroxide with a mass ratio of 1:2, the concentration of degreasing powder is required to be 60g / L, and the degreasing temperature is 60°C , degreasing time 30min. This process can ensure that the anti-rust oil and cutting fluid of the blank are removed, preventing them from affecting the phosphating film formation.

[0025] After degreasing, immerse in the pickling tank to remove the scale on the surface of the parts, prepare hydrochloric acid in the pickling tank, and add a corrosion inhibitor of 5‰ of the total solution, the concentration of hydrochloric acid is 350ml / L, room temperature, pickling time 180s. The pickling process can remove the oxide skin on the surface of the blank, and ensure that the phosphating film is uniform and has a high bonding force.

[0026] The surface conditioner is a thin-film zinc-based phosphating surfa...

Embodiment 2

[0033] Pre-degreasing and degreasing adopt hot-dip degreasing, and hot-dipping degreasing is prepared by mixing degreasing powder and sodium hydroxide with a mass ratio of 1:2. The concentration of degreasing powder is required to be 100g / L, and the degreasing temperature is 80°C , degreasing time 50min.

[0034] After degreasing, immerse in the pickling tank to remove the scale on the surface of the parts, prepare hydrochloric acid in the pickling tank, and add a corrosion inhibitor of 5‰ of the total solution, the concentration of hydrochloric acid is 500ml / L, room temperature, pickling time 300s.

[0035] The surface conditioner is a thin-film zinc phosphating surface conditioner, the concentration of the surface conditioner is 5‰ compared to water, the surface conditioner is adjusted at room temperature, and the treatment time is 20s.

[0036] Thin-film zinc-based phosphating chemical phosphating, its main components are zinc ions and phosphate radicals, the process requir...

Embodiment 3

[0041] Pre-degreasing and degreasing adopt hot-dipping degreasing, hot-dipping degreasing is prepared by mixing degreasing powder and sodium hydroxide with a mass ratio of 1:2, the concentration of degreasing powder is 80g / L, and the degreasing temperature is 70°C. The degreasing time is 40min.

[0042] After degreasing, dip into the pickling tank to remove the scale on the surface of the parts, prepare hydrochloric acid in the pickling tank, and add a corrosion inhibitor of 5‰ of the total solution, the concentration of hydrochloric acid is 475ml / L, room temperature, pickling time 220s.

[0043] The surface conditioner is a thin film zinc phosphating surface conditioner, the concentration of the surface conditioner is 4‰ compared with water, the surface conditioner is adjusted at room temperature, and the treatment time is 20s.

[0044] Thin-film zinc phosphating chemical phosphating, its main components are zinc ions and phosphate radicals, the process requirements are total...

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Abstract

The phosphating film passivation process comprises the following steps: pre-deoiling the surfaces of steel products and components, deoiling, washing with water for multiple times, pickling to remove oxide skin, adjusting the surfaces and phosphating. Passivation is carried out after the last time of washing; the passivating agent comprises the following components in percentage by mass: 17-20% of boric acid, 13-17% of monoethanolamine, 25-27% of triethanolamine, 8-10% of sodium silicate and the balance of an anti-rust component; the passivating agent and pure water are prepared into a passivating solution according to the proportion of 4-6%, meanwhile, the passivating solution is heated to 60-80 DEG C, after passivating is conducted for 20-30 s, centrifugal drying is conducted, anti-rust oil is dip-coated, and finally centrifugal drying is conducted again. The low-concentration 4-6% passivation solution is adopted, the passivation temperature is 60-80 DEG C, and the production cost is saved; under the combined action of passivation and dip-coating of anti-rust oil, a neutral salt spray test (NSS) meets the requirement that no red rust is generated within 72 hours, rust is avoided for one year in the natural environment, and the corrosion-resistant effect is improved by 3-4.5 times.

Description

technical field [0001] The invention belongs to the field of phosphating anticorrosion of iron and steel parts, in particular to a phosphating film passivation process. Background technique [0002] Phosphating of steel is a common surface treatment process, which is a phosphate chemical conversion coating formed chemically and electrochemically. Because phosphating has anti-corrosion and anti-friction properties and can effectively enhance the bonding force between the paint film and the workpiece, phosphating is widely used in fasteners and paint base films in engine gearboxes. However, only relying on the phosphating layer, the corrosion resistance of the workpiece is still poor, and it will rust quickly when it encounters water vapor. Therefore, in actual production, anti-rust oil will be selected to improve corrosion resistance, but too much oil will cause transportation problems. And the inconvenience of assembly, if the amount of oil is too small, the anti-rust effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/78C23C22/73C23C22/83C23C22/12
Inventor 陆健徐雪生
Owner 鹰普航空科技(南通)有限公司
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