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Pretreatment process for metal coating

A pre-treatment and coating technology, applied in the direction of metal material coating process, can solve the problems of difficult phosphating slag wastewater treatment, high energy consumption and high cost in the phosphating process, and achieve cost reduction, improved adhesion and corrosion resistance. Sexual, easy-to-handle effects

Inactive Publication Date: 2012-11-28
GUANGDONG LIANSU TECH INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the phosphating process has high energy consumption, high cost, strong toxicity, harmful heavy metals, phosphating slag and difficult wastewater treatment

Method used

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Embodiment Construction

[0023] The invention provides a metal coating pretreatment process, which comprises the following steps in turn:

[0024] a. Pre-degreasing: put the workpiece into the pre-degreasing tank for pre-degreasing treatment;

[0025] b. Degreasing: put the workpiece into the degreasing tank for degreasing treatment;

[0026] c. Washing 1: Put the degreased workpiece into the first washing tank for the first cleaning;

[0027] d. Washing 2: Put the degreased workpiece into the second washing tank for the second cleaning;

[0028] e. Vitrification: Put the workpiece into the vitrification treatment tank, and use vitrification agent for vitrification treatment to form vitrification film;

[0029] f. Water washing three: put the workpiece forming the vitrified film into the third washing tank for the third cleaning;

[0030] g. Washing 4: Put the workpiece forming the vitrified film into the fourth washing tank for the fourth washing.

[0031] The invention adopts vitrification inste...

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Abstract

The invention provides a pretreatment process for metal coating, comprising the following steps: pre-degreasing, degreasing, water washing one, water washing two, water washing three, and water washing four. The method replaces phosphatization by vitrification, and uses a phosphate-free environment-friendly vitrification agent for performing vitrification treatment to a workpiece, without waste residue or heavy metals, more environment-friendly and convenient to process. The vitrification film formed on the surfaces of the processed metal work pieces such as steels, zinc materials, galvanizing plates, electro-zinc plates and aluminium materials can improve the adhesion force and corrosion resistance, and is suitable for the coating by various types of paints. At the same time, the pretreatment process is simplified in technology, low in energy consumption and cost for all the steps processed at room temperature.

Description

technical field [0001] The invention relates to metal surface treatment technology, in particular to a pre-treatment process for metal coating. Background technique [0002] In real life, in order to achieve the purpose of anti-corrosion, household appliances, office furniture, hardware workpieces, etc., often carry out metal surface treatment, including pre-painting treatment process and coating process. The pre-painting treatment process is to remove the grease, rust, dust, etc. attached to the metal surface before painting, and form a conversion film to provide a good base suitable for painting requirements to ensure that the coating has good adhesion and corrosion resistance . At present, the commonly used pre-painting treatment processes are: pre-degreasing, degreasing, industrial washing 1, industrial washing 2, surface adjustment, phosphating, industrial washing 3, industrial washing 4, pure water washing 1, pure water washing 2, pouring water, drying , the process ...

Claims

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Application Information

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IPC IPC(8): C23C22/06
Inventor 方有泉
Owner GUANGDONG LIANSU TECH INDAL
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