Steel Phosphating Process

A steel and process technology, applied in the coating process of metal materials, etc., can solve the problems of coarse phosphating film crystallization, easy rusting of workpieces, long phosphating time, etc., achieve dense and uniform film crystallization, eliminate uneven corrosion, increase The effect of the number of nuclei

Active Publication Date: 2019-11-05
FUJIAN ANSHUN TRANSFORMER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the film formed by the traditional phosphating method is thicker, the crystallization of the phosphating film is coarser, the phosphating time is long, and the workpiece is easy to rust after phosphating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A kind of preparation of surface adjustment fluid: it comprises the following steps:

[0032] (1) Preparation of surface modifier: In parts by weight, 220 parts of deionized water weighed were heated to 70°C. Then, while stirring, 70 parts of disodium hydrogen phosphate, 50 parts of sodium tripolyphosphate and 4 parts of sodium hydroxide were sequentially added to the heated deionization, and then the temperature was raised to about 100°C, and then 6 parts of potassium fluorotitanate and 20 parts of amino trimethylene phosphonic acid, stirred for 25 minutes, then added 4 parts of sodium pyrophosphate, stirred for another 12 minutes to form a uniform mixture and then cooled.

[0033] (2) Take 0.2 kg of the surface regulator prepared in step (1), add it into 50 L of water and stir evenly, and then add an appropriate amount of water to set the volume to 100 L to obtain the surface regulator.

Embodiment 2

[0035] A kind of preparation of surface adjustment fluid: it comprises the following steps:

[0036] (1) Preparation of surface modifier: In parts by weight, 250 parts of deionized water weighed were heated to 65°C. Then, while stirring, 60 parts of disodium hydrogen phosphate, 40 parts of sodium tripolyphosphate and 2 parts of sodium hydroxide were sequentially added to the heated deionization, and then the temperature was raised to about 100°C, and then 5 parts of potassium fluorotitanate and 10 parts of amino trimethylene phosphonic acid, stirred for 20 minutes, then added 2 parts of sodium pyrophosphate, stirred for another 10 minutes to form a uniform mixture and then cooled.

[0037] (2) Take 0.3 kg of the surface regulator prepared in step (1), add it into 50 L of water and stir evenly, and then add an appropriate amount of water to set the volume to 100 L to obtain the surface regulator.

Embodiment 3

[0039] A kind of preparation of surface adjustment fluid: it comprises the following steps:

[0040] (1) Preparation of surface modifier: In parts by weight, 200 parts of deionized water weighed were heated to 68°C. Then, while stirring, 80 parts of disodium hydrogen phosphate, 60 parts of sodium tripolyphosphate and 5 parts of sodium hydroxide were sequentially added to the heated deionization, and then the temperature was raised to about 100°C, and then 8 parts of potassium fluorotitanate and 25 parts of amino trimethylene phosphonic acid, stirred for 30 minutes, then added 5 parts of sodium pyrophosphate, and stirred for another 15 minutes to form a uniform mixture and then cooled.

[0041] (2) Take 0.08 kg of the surface regulator prepared in step (1), add it into 50 L of water and stir evenly, and then add an appropriate amount of water to set the volume to 100 L to obtain the surface regulator.

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PUM

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Abstract

The invention relates to a steel phosphorization process. The steel phosphorization process comprises the following process steps including (1) grease removal, (2) water washing, (3) acid pickling, (4) secondary water washing, (5) neutralizing and (6) surface conditioning, wherein steel treated in the step (5) is placed into surface conditioning liquid at the temperature ranging from 40 DEG C to 45 DEG C to be treated for 1 min to 2 min, and the surface conditioning liquid is composed of 0.08-0.3 kg of a surface conditioning agent and the balance water in every 100 L of surface conditioning liquid; raw materials for preparing the surface conditioning agent comprise, by weight, 200-250 parts of water, 60-80 parts of disodium hydrogen phosphate, 40-60 parts of sodium tripolyphosphate, 2-5 parts of sodium hydroxide, 5-8 parts of potassium fluotitanate, 10-25 parts of amino trimethylene phosphonic acid and 2-5 parts of sodium pyrophosphate; and by means of the phosphorization process, all growth processes of a conversion coating can be conveniently completed at the low phosphorization temperature within short time, coating crystals are compact and even, and the attachment force is high.

Description

technical field [0001] The invention relates to a steel phosphating process. Background technique [0002] Iron and steel phosphating is the process of putting the pretreated steel into the phosphating solution to deposit a water-insoluble crystalline phosphate conversion film on the surface of the steel. However, the film formed by the traditional phosphating method is thicker, the crystallization of the phosphating film is coarser, the phosphating time is long, and the workpiece is easy to rust after phosphating. Contents of the invention [0003] The purpose of the present invention is to provide a steel phosphating process with simple process, short phosphating time, mild phosphating condition and capable of making the formed film crystal dense and uniform. [0004] The purpose of the present invention is achieved through the following technical solutions: a steel phosphating process, which comprises the following process steps: [0005] (1) Degreasing: put the steel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/78C23C22/80C23G1/24C23G1/08
CPCC23C22/78C23C22/80C23G1/083C23G1/24
Inventor 何煜青游上云雷福荣徐斌何俊杰
Owner FUJIAN ANSHUN TRANSFORMER
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