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Metal plate coating pretreatment process

A metal sheet and pre-treatment technology, applied in metal material coating process, coating, superimposed layer plating and other directions, can solve the problem of high energy consumption, achieve the effect of low energy consumption, simple operation and improved adhesion

Active Publication Date: 2021-01-22
上海福阜机械科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the related technologies mentioned above, the inventor believes that in the pretreatment process of metal coating, the temperature needs to be controlled at about 55°C when using the phosphating process, and the energy consumption is relatively high.

Method used

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Embodiment 1

[0046] A pre-treatment process for metal plate coating, comprising the steps of:

[0047] S1. For the first water washing, use industrial tap water at a temperature of 35°C to spray and wash the surface of the metal plate for 60 seconds, and the spray pressure is 0.1MPa;

[0048] S2, Spray pre-degreasing, use a degreasing solution with a temperature of 25°C and a pH value of 12 to spray and pre-degrease the surface of the metal plate for 120s, and spray pressure 0.1MPa;

[0049] S3. Spray main degreasing, use a degreasing solution with a temperature of 25°C and a pH value of 12 to spray the main degreasing on the surface of the metal plate for 150s, and spray pressure 0.1MPa;

[0050] S4. For the second washing, industrial tap water at a temperature of 20°C is used to spray and wash the surface of the metal plate. The pH of the industrial tap water after washing is controlled at <8, for 60 seconds, and the spray pressure is 0.1 MPa;

[0051] S5. For the third washing, use ind...

Embodiment 2

[0060] A pre-treatment process for metal plate coating, comprising the steps of:

[0061] S1. For the first water washing, use industrial tap water at a temperature of 45°C to spray and wash the surface of the metal plate for 30 seconds, and the spray pressure is 0.12MPa;

[0062] S2. Spray pre-degreasing, use a degreasing solution with a temperature of 45°C and a pH value of 14 to spray and pre-degrease the surface of the metal plate for 60 seconds, and the spray pressure is 0.12 MPa;

[0063] S3. Spray main degreasing, use a degreasing solution with a temperature of 45°C and a pH value of 13 to spray the main degreasing on the surface of the metal plate for 90s, and the spray pressure is 0.12MPa;

[0064] S4. For the second washing, use industrial tap water at a temperature of 30°C to spray and wash the surface of the metal plate. The pH of the industrial tap water after washing is controlled at <8, for 30 seconds, and the spray pressure is 0.12 MPa;

[0065] S5. For the th...

Embodiment 3

[0074] A pre-treatment process for metal plate coating, comprising the steps of:

[0075] S1. For the first water washing, use industrial tap water at a temperature of 40°C to spray and wash the surface of the metal plate for 45 seconds, and the spray pressure is 0.11MPa;

[0076] S2. Spray pre-degreasing, use a degreasing solution with a temperature of 35°C and a pH value of 13 to spray and pre-degrease the surface of the metal plate for 90 seconds, and the spray pressure is 0.11 MPa;

[0077] S3. Spray main degreasing, use a degreasing solution with a temperature of 35°C and a pH value of 12.5 to spray the main degreasing on the surface of the metal plate for 120s, and the spray pressure is 0.11MPa;

[0078] S4. For the second washing, industrial tap water at a temperature of 25°C is used to spray and wash the surface of the metal plate. The pH of the industrial tap water after washing is controlled at <8, for 45 seconds, and the spray pressure is 0.11 MPa;

[0079] S5. For...

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Abstract

The invention relates to the technical field of plate coating pretreatment, and particularly discloses a metal plate coating pretreatment process. The process comprises the following steps of S1, water washing for the first time; S2, spraying for pre-degreasing; S3, spraying for main degreasing; S4, water washing for the second time; S5, water washing for the third time; S6, spraying silane for conversion; S7, water washing for the fourth time; S8, water washing for the fifth time; and S9, drying. Compared with a related phosphating process, the coating pretreatment process is high in corrosion resistance, high in adhesive force, more environmentally friendly and low in energy consumption, and when subsequent water washing is balanced, the wastewater treatment cost is greatly reduced.

Description

technical field [0001] The present application relates to the technical field of pre-treatment of plate coating, and more specifically, it relates to a pre-treatment process of metal plate coating. Background technique [0002] Pre-painting treatment is to eliminate various oil stains (such as lubricating fluid, grease, sweat, etc.) on the surface of the metal sheet, and the cleaning process to make the coated surface clean is an essential process for painting, and the metal sheet includes cold-rolled sheets , galvanized sheet, aluminum parts, etc. Pre-painting treatment includes degreasing, surface conversion, etc., which are important steps in painting, a necessary means to improve the adhesion and protective performance of the coating film, and a prerequisite to ensure good quality of the coating. [0003] Phosphating and chromizing processes are widely used metal coating pre-treatment technologies. Due to the presence of elements such as phosphorus and chromium that are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/76C23C22/48C23C22/78C23C22/82C23C26/00C23C28/04C23F15/00C23G1/14
CPCC23C22/76C23C22/48C23C22/78C23C22/82C23C26/00C23C28/04C23F15/00C23G1/14
Inventor 张华锋蔺富胡文元
Owner 上海福阜机械科技有限公司
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