Thick film phosphating method

A thick film and phosphating solution technology, which is applied in the coating process of metal materials, etc., can solve the problems of rough surface, uneven film thickness, low hardness, etc., and achieve smooth and fine surface, high film thickness and short reaction time short effect

Inactive Publication Date: 2012-07-04
ANHUI QIMING SURFACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For large workpieces, the cost of traditional phosphating treatment is too high, and the film forming time is long, the film is loose, the film thickness is uneven

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1

[0029] The phosphating solution of this embodiment includes 6.5% of Marif salt, 2% of zinc nitrate, 0.5% of phosphoric acid, 0.2% of sodium fluoroborate and 0.01% of ferric nitrate, and the balance is water, by weight. The free acidity of this example is 11.7 points, and the total acidity is 84 points. Take 10ml of phosphating solution, add two to three drops of bromophenol blue indicator, and use 0.1mol / L NaOH solution to neutralize the volume (ml) consumed to purple is the number of free acidity points; then add two to three drops Drop phenolphthalein indicator, continue to use 0.1mol / L NaOH solution to neutralize the total volume (ml) of all the NaOH solution consumed to red is the total acidity point.

[0030] The phosphating process includes the following steps:

[0031] (1) Use pre-degreasing and degreasing treatment to remove oil stains on the surface of the workpiece and then wash with water;

[0032] (2) Pickling the surface of the workpiece after removin...

Example Embodiment

[0038] Example 2

[0039] The phosphating solution of this embodiment includes 5% of Marzhef salt, 1.5% of zinc nitrate, 0.65% of phosphoric acid, 0.1% of sodium fluoroborate and 0.03% of ferric nitrate, and the balance is water, by weight. In this example, the free acidity is 16.5 points, and the total acidity is 105.5 points.

[0040] The phosphating process includes the following steps:

[0041] (1) Use pre-degreasing and degreasing treatment to remove oil stains on the surface of the workpiece and then wash with water;

[0042] (2) Pickling the surface of the workpiece after removing the greasy dirt, specifically, first pickling with hydrochloric acid for 3 minutes, and then pickling with phosphoric acid for 5 minutes;

[0043] (3) Wash the workpiece with water, and wash the workpiece to PH=7 under normal temperature conditions;

[0044] (4) Then adjust the workpiece with a titanium salt meter for 60 seconds, keep the pH value at 9, and adjust the concentration of the titanium salt ...

Example Embodiment

[0049] Example 3

[0050] The phosphating solution of this embodiment includes 5% of Marif's salt, 2.5% of zinc nitrate, 0.35% of phosphoric acid, 0.3% of sodium fluoroborate, 0.02% of ferric nitrate and 0.01% of ethylenediaminetetraacetic acid. The balance is water, by weight meter. The free acidity in this example is 10.5 points, and the total acidity is 74 points.

[0051] The phosphating process includes the following steps:

[0052] (1) Use pre-degreasing and degreasing treatment to remove oil stains on the surface of the workpiece and then wash with water;

[0053] (2) Pickling the surface of the workpiece after removing the greasy dirt, specifically, first pickling with hydrochloric acid for 3 minutes, and then pickling with phosphoric acid for 5 minutes;

[0054] (3) Wash the workpiece with water, and wash the workpiece to PH=7 under normal temperature conditions;

[0055] (4) Then adjust the workpiece with a titanium salt meter for 45 seconds, keep the pH value at 10, and adju...

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Abstract

The invention discloses a thick film phosphating method. The method comprises the following steps of: removing oil stain on the surface of a workpiece and washing with water; washing the surface subjected to oil stain removal by using acid; washing the workpiece with water; carrying out surface conditioning on the workpiece by using a titanium salt; putting the workpiece subjected to surface conditioning in a phosphating solution for phosphating processing; and washing the workpiece. The workpiece provided by using the thick film phosphating method has higher film forming thickness, smooth and fine surface and no rust after a salt spray test; meanwhile the thick film phosphating method disclosed by the invention has the advantages of short reaction time and strong corrosion resistance, can meet the thickness requirements of different phosphate films, and is suitable for the phosphating requirements of the workpiece with high corrosion and high hardness; and the workpiece can meet the process requirements in a small-scale test and an intermediate-scale test.

Description

technical field [0001] The invention relates to a phosphating treatment method for the inner wall of an oil tank, in particular to a thick film phosphating method. Background technique [0002] Phosphating treatment is a treatment method that chemically reacts metal with phosphoric acid or phosphate to form a stable phosphate film on its surface. Treating workpieces with traditional phosphating solutions consumes a lot of energy and takes a long time. For large workpieces, the cost of traditional phosphating treatment is too high, and the film forming time is long, the film is loose, the film thickness is uneven, the hardness is not high, the surface is not smooth, and the corrosion resistance is poor, especially not suitable for gears. Phosphating of precision workpieces. Contents of the invention [0003] The object of the present invention is to overcome the deficiencies of the prior art and provide a thick-film phosphating method, which is easy to use and improves th...

Claims

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Application Information

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IPC IPC(8): C23C22/07C23C22/36
Inventor 孟强徐成龙闫永丽刘小琳李磊朱庆成
Owner ANHUI QIMING SURFACE TECH
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