Precise composite phosphating tank solution and phosphating technology thereof

A phosphating tank and precision technology, applied in the coating process of metal materials, etc., can solve the problems of reducing the surface roughness of the workpiece, difficulty in film formation, uneven film layer, etc., and achieve the effect of simple formula

Active Publication Date: 2013-07-17
AVIC LIYUAN HYDRAULIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The existing phosphating process has the problem of reducing the surface roughness of the workpiece to varying degrees, and at the same time causes a large variation in the geometric size of the part, and the hardness of the film layer is very low; for some parts that have undergone surface chemical heat treatment, traditional phosphating Defects such as difficulty in film formation and uneven film layer often occur
Due to these shortcomings, the application of traditional phosphating on precision friction pair parts has great limitations

Method used

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  • Precise composite phosphating tank solution and phosphating technology thereof

Examples

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Embodiment 1

[0025] Example 1. A precision compound phosphating bath solution, its composition is phosphoric acid, manganese dihydrogen phosphate and phosphating agent, specifically, commercially available phosphoric acid 6ml / l, ferromanganese phosphate 29g / l, phosphating agent 31g / l. The composition of the phosphating agent is calcium nitrate, zinc nitrate and sodium fluoride, and the mass ratio is 17:11:1 in sequence.

[0026] The phosphating process using the above-mentioned precision composite phosphating bath solution includes the following steps: degreasing, activating, neutralizing, and phosphating. Wherein: the degreasing process is specifically to clean the parts with an aqueous cleaning agent or an organic solvent, and then use electrolytic degreasing to completely remove the oil on the surface of the workpiece; the activation process specifically is to clean the workpiece after degreasing Carry out weak corrosion treatment in the hydrochloric acid aqueous solution that volume r...

Embodiment 2

[0027] Example 2. A precision composite phosphating bath solution, the composition of which is phosphoric acid, ferromanganese phosphate and phosphating agent, specifically, commercially available phosphoric acid 7ml / l, ferromanganese phosphate 28g / l, and phosphating agent 31g / l. The composition of the phosphating agent is calcium nitrate, zinc nitrate and sodium fluoride, and the mass ratio is 15:10:1.5 in turn. Commercially available phosphoric acid is purchased from the market, and commercially available phosphoric acid has a specified concentration range.

[0028] The phosphating process using the above-mentioned precision composite phosphating bath solution includes the following steps: degreasing, activating, neutralizing, and phosphating. Wherein: the degreasing process is specifically to clean the parts with an aqueous cleaning agent or an organic solvent, and then use electrolytic degreasing to completely remove the oil on the surface of the workpiece; the activation...

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Abstract

The invention discloses a precise composite phosphating tank solution. The phosphating tank solution is characterized in that: 1l of the phosphating tank solution comprises 5-7ml of phosphoric acid, 28-30g of iron manganese dihydrogen phosphate, and 28-33g of a phosphating medicament; and a phosphating technology with the precise composite phosphating tank solution comprises steps of degreasing, activation, neutralization and phosphatization. The phosphating tank solution which allows the geometric precision and the surface roughness of parts to be maintained has the characteristics of simpleformula, fast film forming speed and good corrosion resistance.

Description

technical field [0001] The invention relates to a phosphating bath solution and a phosphating process, in particular to a precision composite phosphating bath solution and a phosphating process. Background technique [0002] Although more than 100 years have passed since American T.W. Coslet made the world's first zinc-based phosphating solution, there are still few reports on in-depth research on phosphating theory. As a means of surface modification, phosphating is listed in relevant textbooks and surface modification manuals (such as "Material Surface Technology and Its Application Manual" edited by Qian Miaogen, published by Mechanical Industry Press, "Modern Surface Technology" etc.) There are relatively few introductions, phosphating can be widely used in industry, and it mainly depends on summarizing through practice and constantly improving the process. [0003] The existing phosphating process has the problem of reducing the surface roughness of the workpiece to va...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/18C23C22/22
Inventor 王仁江周武王弟珍周莉
Owner AVIC LIYUAN HYDRAULIC
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