Black phosphating liquid and use method thereof

A phosphating solution, black technology, applied in the field of black phosphating solution, can solve the problems of long process, poor corrosion resistance, environmental pollution, etc., and achieve the effect of black and firm color, fine and uniform film layer, and simple process operation

Active Publication Date: 2013-03-06
CHANGSHA WOER METAL SURFACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As we all know, alloy steel contains nickel, chromium, molybdenum, rare earth and other elements before the surface treatment, and the pickling activation process is used to pollute the environment, and the wastewater treatment is difficult. The phosphating solution currently used adopts a step-by-step treatment process, which takes a long time , long processing time, rough film formation and uneven blackness, poor corrosion resistance
Moreover, if the surface of the part is not handled carefully, it will be over-corroded, which will affect the quality of phosphating and the precision of the part.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of black phosphating solution is composed of the following substances by weight percentage:

[0039] Acid manganese phosphate 5%, diammonium hydrogen phosphate 3%, cobalt nitrate 2%, guanidine nitrate 1%, hydroquinone 1.5%, phosphoric acid (mass concentration 85%) 0.5%, hydroxylammonium sulfate 0.2%, purified water balance.

[0040] Use the above-mentioned black phosphating solution to treat the parts: pre-treat the alloy steel parts to be treated through degreasing, water washing and surface conditioning, and then immerse the pre-treated alloy steel parts in the black phosphating solution for 10 minutes. The temperature of the phosphating solution is 60°C, and the treatment results are shown in Table 1. The alloy steel refers to alloy steel containing nickel, chromium, molybdenum, rare earth and other elements, such as: 20 chromium molybdenum titanium.

Embodiment 2

[0042] A kind of black phosphating solution is composed of the following substances by weight percentage:

[0043] Acid manganese phosphate 3%, diammonium hydrogen phosphate 2%, cobalt nitrate 1.5%, guanidine nitrate 2%, hydroquinone 0.8%, phosphoric acid (mass concentration 85%) 1%, hydroxylammonium sulfate 0.5%, purified water balance.

[0044] Use the above-mentioned black phosphating solution to treat the parts: pre-treat the alloy steel parts to be treated through degreasing, water washing and surface conditioning, and then immerse the pre-treated alloy steel parts in the black phosphating solution for 15 minutes. The temperature of the phosphating solution is 50°C, and the treatment results are shown in Table 1. The alloy steel refers to alloy steel containing nickel, chromium, molybdenum, rare earth and other elements, such as: 20 chromium molybdenum titanium.

Embodiment 3

[0046] A kind of black phosphating solution is composed of the following substances by weight percentage:

[0047] 4% acidic manganese phosphate, 1% diammonium hydrogen phosphate, 1% cobalt nitrate, 0.7% phosphoric acid (mass concentration 80%), 0.3% hydroxylamine sulfate, and the balance of purified water.

[0048] Use the above-mentioned black phosphating solution to treat parts: pre-treat the alloy steel parts to be treated by degreasing, washing and surface adjustment, and then wipe the above-mentioned black phosphating solution on the surface of the pre-treated alloy steel parts for 5 minutes. , the temperature of the phosphating solution is 50°C, and the treatment results are shown in Table 1. The alloy steel refers to alloy steel containing nickel, chromium, molybdenum, rare earth and other elements, such as: 20 chromium molybdenum titanium.

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PUM

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Abstract

The invention belongs to the technical field of metal surface treatment, and particularly relates to black phosphating liquid for phosphating the surface of alloy steel which does not need to be acid cleaned in preliminary treatment. The black phosphating liquid comprises components with the following weight percentage: 2 percent to 5 percent of acidic manganese phosphate, 2 percent to 4 percent of diammonium hydrogen phosphate, 1 percent to 3 percent of cobalt nitrate, 1 percent to 2 percent of guanidine nitrate, 0.5 percent to 1.5 percent of hydroquinone, 0.2 percent to 1 percent of hydroxylamine sulfate, 0.5 percent to 2 percent of phosphoric acid with the mass concentration being 80 percent to 90 percent, and the rest is pure water. Due to the use of the black phosphating liquid, the operation is simple, the stability is good, the film forming speed is high, a formed film is fine and uniform, the color is black, the film forming strength is high, the corrosion resistance is strong and the like, and the black phosphating liquid is applicable to the surface treatment of alloy steel parts of various models.

Description

technical field [0001] The invention belongs to the technical field of surface chemical treatment, in particular to a black phosphating solution for phosphating the surface of alloy steel without pickling in pretreatment. Background technique [0002] As we all know, alloy steel contains nickel, chromium, molybdenum, rare earth and other elements before the surface treatment, and the pickling activation process is used to pollute the environment, and the wastewater treatment is difficult. The phosphating solution currently used adopts a step-by-step treatment process, which takes a long time , the processing time is long, the film formation is rough and the blackness is uneven, and the corrosion resistance is poor. Moreover, if the surface of the part is not handled carefully, it will be over-corroded, which will affect the quality of phosphating and the precision of the part. Contents of the invention [0003] Aiming at the deficiencies of the prior art, the present inve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/18
Inventor 黄勇
Owner CHANGSHA WOER METAL SURFACE TECH
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