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Cobalt-containing phosphating agent, metal part and surface phosphating treatment method thereof

A phosphating agent and metal parts technology, applied in the field of metal parts and their surface phosphating treatment, cobalt-containing phosphating agent, can solve the problems of high energy consumption, more precipitation, and short service life of phosphating agent

Inactive Publication Date: 2021-04-30
SHENZHEN HENGZHAOZHI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing phosphating agents have high energy consumption, high precipitation, short service life, weak anti-corrosion performance, and complicated operation (surface adjustment is required before phosphating, and phosphating agents need to be added regularly and quantitatively in the phosphating solution, and strict control is required. acidity)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Mix each composition according to following parts by weight (total amount is 1000 parts by weight): 5 parts of phosphoric acid, the zinc oxide of 3 parts, the magnesium nitrate of 0.5 part, the aluminum nitrate of 0.5 part, the cobalt nitrate of 0.5 part and the balance are water, Stir and mix evenly to prepare a phosphating agent.

[0019] Treatment method: prepare a phosphating agent solution; metal parts take cold-rolled plate as an example, immerse the cold-rolled plate in the phosphating agent solution, control the temperature at 35°C, soak for 10 minutes, wash the metal parts with water, and dry. During the treatment process, the phosphating agent can be added in time to ensure the effect of the working fluid. The phosphating drying temperature should not be too high, and should be controlled at room temperature to 120 degrees Celsius to prevent cracks in the film layer due to excessive temperature.

[0020] After being treated with the above phosphating agent so...

Embodiment 2

[0022] Mix each composition according to following parts by weight (total amount is 1000 parts by weight): 10 parts of phosphoric acid, the zinc oxide of 5 parts, the magnesium nitrate of 1 part, the magnesium nitrate of 1 part, the cobalt nitrate of 1 part, the nickel nitrate of 0.2 part , 0.5 parts of tannic acid, the balance being water, stirring, mixing evenly, and preparing a phosphating agent.

[0023] Treatment method: prepare a phosphating agent solution; metal parts take cold-rolled plate as an example, immerse the cold-rolled plate in the phosphating agent solution, control the temperature at 35°C, soak for 10 minutes, wash the metal parts with water, and dry. During the treatment process, the phosphating agent can be added in time to ensure the effect of the working fluid. The phosphating drying temperature should not be too high, and should be controlled at room temperature to 120 degrees Celsius to prevent cracks in the film layer due to excessive temperature.

...

Embodiment 3

[0026] Mix each composition according to following parts by weight (total amount is 1000 parts by weight): 20 parts of phosphoric acid, the zinc oxide of 8 parts, the magnesium nitrate of 2 parts, the aluminum nitrate of 1 part, the cobalt nitrate of 2 parts, the nickel nitrate of 1 part , 1 part of tannic acid, the balance is water, stir, mix well, and prepare a phosphating agent.

[0027] Treatment method: prepare a phosphating agent solution; metal parts take cold-rolled plate as an example, immerse the cold-rolled plate in the phosphating agent solution, control the temperature at 35°C, soak for 10 minutes, wash the metal parts with water, and dry. During the treatment process, the phosphating agent can be added in time to ensure the effect of the working fluid. The phosphating drying temperature should not be too high, and should be controlled at room temperature to 120 degrees Celsius to prevent cracks in the film layer due to excessive temperature.

[0028] After being...

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PUM

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Abstract

The invention relates to a cobalt-containing phosphating agent, a metal part and a surface phosphating treatment method thereof. The phosphating agent is used for metal part surface pretreatment, and comprises the following components in parts by weight, based on 1000 parts: 5-30 parts of phosphoric acid, 3-10 parts of zinc oxide, 0.5-3 parts of a magnesium salt, 0.5-3 parts of an aluminum salt, 0.5-5 parts of cobalt nitrate and the balance of water. A film layer structure formed by the phosphating agent is compact in structure and firm in adhesion force, and a continuously-even and colored phosphating layer is generated on the surface of the metal part for being applied to phosphating treatment before spraying of steel surfaces such as a cold-rolled plate, a hot-rolled plate and angular steel. A phosphating solution is long in service, is free of wastewater, and can be used for phosphating by brushing, immersing, spraying or a combined way thereof. The phosphating agent can be dried or naturally dried in air at a temperature of 10-50 DEG C, saves energy consumption to a great extent, is short in phosphating time, is free of surface adjustment before use, does not need to add a promoter, and is simple and labor-saving in operation.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a cobalt-containing phosphating agent, a metal piece and a surface phosphating 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 requires pretreatment before surface treatment, for example, cleaning, decontamination and degreasing, and metal parts for some purposes also need phosphating, passivation and other treatments. [0003] Phosphating treatment generally uses a phosphating agent to pretreat metal parts to form a film layer on the surface of the metal part for subsequent surface treatment and increase the bonding force and corrosion resistance of the subsequent film. For example, before s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/56C23C22/73C23C22/76
CPCC23C22/56C23C22/73C23C22/76
Inventor 王饶玲
Owner SHENZHEN HENGZHAOZHI TECH CO LTD
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