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Steel surface non-phosphorus passivator, steel workpiece and surface passivation treatment method of steel workpiece

A technology of steel surface and passivation agent, applied in the direction of metal material coating process, etc., can solve the problems of high energy consumption of phosphating agent, high environmental damage, and high phosphorus content, and achieves firm adhesion, simple operation, and energy consumption. low effect

Inactive Publication Date: 2021-05-07
SHENZHEN HENGZHAOZHI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, phosphating agents are usually used for treatment, but phosphating agents have high energy consumption, more precipitation, and more phosphorus content, which is harmful to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Mix each composition according to the following parts by weight (total amount is 1000 parts by weight): 5 parts of oxalic acid, 1 part of sodium thiosulfate, 0.5 part of molybdenum salt, 0.5 part of cobalt nitrate and the balance are water, stir and mix well , formulated as a phosphorus-free passivator for steel surfaces.

[0019] Treatment method: prepare a phosphorus-free passivator on the surface of steel in the form of a passivation solution; steel workpieces are cold-rolled plates as an example, immerse the cold-rolled plate with a clean surface into the solution of a phosphorus-free passivator on the surface of steel, that is, the passivation solution, The temperature is controlled at 35°C, and after soaking for 10 minutes, the steel workpiece is washed with water and dried. In the process of treatment, passivating agent can be added in time to ensure the effect of working fluid. The drying temperature after passivation should not be too high, and should be contr...

Embodiment 2

[0022] Mix each composition according to following parts by weight (total amount is 1000 parts by weight): 10 parts of oxalic acid, 2 parts of sodium thiosulfate, 1 part of molybdenum salt, 1 part of cobalt nitrate, 0.2 part of sodium fluoride, 0.5 part Tannic acid, the balance is water, stirred, mixed evenly, and prepared as a phosphorus-free passivator for steel surface.

[0023] Treatment method: prepare a phosphorus-free passivator on the steel surface in the form of a passivation solution; steel workpieces take cold-rolled plates as an example, immerse the cold-rolled plate with a clean surface in the solution of a phosphorus-free passivator on the steel surface, and control the temperature at 35°C , after soaking for 10 minutes, the steel workpiece is washed with water and dried. In the process of treatment, passivating agent can be added in time to ensure the effect of working fluid. The drying temperature after passivation should not be too high, and should be control...

Embodiment 3

[0026] Mix each composition according to following parts by weight (total amount is 1000 parts by weight): 15 parts of oxalic acid, 3 parts of sodium thiosulfate, 2 parts of molybdenum salt, 2 parts of cobalt nitrate, 1 part of sodium fluoride, 1 part Tannic acid, the balance is water, stirred, mixed evenly, and prepared as a phosphorus-free passivator for steel surface.

[0027] Treatment method: prepare a phosphorus-free passivator on the steel surface in the form of a passivation solution; steel workpieces take cold-rolled plates as an example, immerse the cold-rolled plate with a clean surface in the solution of a phosphorus-free passivator on the steel surface, and control the temperature at 35°C , after soaking for 10 minutes, the steel workpiece is washed with water and dried. In the process of treatment, passivating agent can be added in time to ensure the effect of working fluid. The drying temperature after passivation should not be too high, and should be controlle...

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PUM

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Abstract

The invention relates to a steel surface non-phosphorus passivator, a steel workpiece and a surface passivation treatment method of the steel workpiece. The steel surface non-phosphorus passivator is used for pretreatment of the steel surface and comprises the following components in parts by weight: 5-20 parts of oxalic acid, 1-3 parts of sodium thiosulfate, 0.5-3 parts of molybdenum salt, 0.5-5 parts of cobalt nitrate and the balance water on the basis of 1000 parts by weight. The steel surface non-phosphorus passivator can generate a continuous and uniform colored passivation layer with a fine structure and firm adhesive force on the steel surface, and is applied to passivation treatment on the surfaces of steel such as cold-rolled sheets, hot-rolled sheets and angle steel before spraying. The passivator is long in service life, and can be used for passivating in a brushing, soaking, spraying or combination mode of brushing, soaking and spraying. The adopted temperature is 10-50 DEG C, drying and natural airing can be achieved, energy consumption is saved to a great extent, the passivation time is short, and the passivation solution does not contain phosphorus and is more environmentally friendly; and the passivator can cooperate with oil-immersed or potassium-immersed soap to achieve rust removal treatment.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a phosphorus-free passivator for iron and steel surfaces, iron and steel workpieces and a surface passivation treatment method thereof. Background technique [0002] In order to improve the surface performance or appearance of the product, the surface of the workpiece is usually treated. For example, the surface treatment process of aluminum, iron and their alloys has penetrated into all walks of life. Moreover, most of the work needs to be pre-treated before surface treatment, for example, cleaning, decontamination and degreasing, and some steel workpieces need to be passivated and passivated. [0003] Passivation treatment generally uses a passivating agent to pretreat the metal surface to form a film layer on the metal surface for subsequent surface treatment to increase the bonding force and corrosion resistance of the subsequent film. For example, before th...

Claims

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Application Information

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IPC IPC(8): C23C22/40C23C22/44
CPCC23C22/40C23C22/44
Inventor 王饶玲
Owner SHENZHEN HENGZHAOZHI TECH CO LTD