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Ultrasonic phosphating solution for carbon steel, preparation method thereof and method for phosphating carbon steel by adopting phosphating solution

A technology of phosphating liquid and carbon steel, applied in the field of phosphating, to achieve the effect of dense phosphating film, fine particles and small surface roughness

Inactive Publication Date: 2015-05-27
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical feature described in this patented technology involves combining different types of chemicals together for better performance on metal surfaces like steel or copper. These combinations help create stronger films that resist scale degradation even at high temperatures. Additionally, it suggests applying an acoustic wave near the end of each step when forming the phospitting layer before depositing another layer onto them. By doing these techniques, we aimed towards improving the efficiency of the treatment processes.

Problems solved by technology

This technical problem addressed in this patented text relates to improving the efficiency and safety of chemical vapor phase depositing processes involving metals like nickel or chrome nitride due to their unique environmental concerns: they may contaminate environments where these materials act as impurities. Additionally, the presence of various substances added to the bath increases the difficulty level needed for achieving desired levels of purification and stability over long periods of operation without causing any negative effects upon humans or animals.

Method used

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  • Ultrasonic phosphating solution for carbon steel, preparation method thereof and method for phosphating carbon steel by adopting phosphating solution
  • Ultrasonic phosphating solution for carbon steel, preparation method thereof and method for phosphating carbon steel by adopting phosphating solution
  • Ultrasonic phosphating solution for carbon steel, preparation method thereof and method for phosphating carbon steel by adopting phosphating solution

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preparation example Construction

[0035] A preparation method of a carbon steel ultrasonic phosphating solution of the present invention comprises the following steps:

[0036] (1) Dissolve ZnO with water to make a paste, then add 85% of H 3 PO 4 Add, stir and age for more than 24h;

[0037] (2) adding 50% of Mn(NO) in the solution obtained in step (1) successively 3 ) 2 , NaNO 3 , hydroxylamine sulfate, stir evenly, add distilled water to constant volume to obtain a phosphating solution; the proportion of each component in the described phosphating solution in parts by weight is:

[0038] ZnO: 5-20g / L, 85% H in mass percentage 3 PO 4 : 50-80g / L, hydroxylamine sulfate: 2-14g / L, NaNO 3 : 20-50g / L, 50% Mn (NO 3 ) 2 : 2-12g / L;

[0039] (3) Add NaOH solution dropwise to the phosphating solution to adjust the pH of the phosphating solution to 2-3.

[0040] The pH of the phosphating solution of the present invention is preferably 2.4-2.8. PH value is an important parameter of phosphating process. The siz...

Embodiment 1

[0053] (1) Dissolve ZnO with water to make a paste, then add 85% of H 3 PO 4 Add, stir and age for more than 24h;

[0054] (2) adding 50% of Mn(NO) in the solution obtained in step (1) successively 3 ) 2 , NaNO 3 , hydroxylamine sulfate (HAS), stir evenly, add distilled water to make the phosphating solution;

[0055] (3) Add NaOH solution dropwise to the phosphating solution to adjust the pH of the phosphating solution.

[0056] The phosphating solution obtained by this method, the parts by weight of each component in parts by weight are:

[0057] ZnO: 18g / L, 85%H 3 PO 4 : 80g / L, hydroxylamine sulfate (HAS): 12g / L, NaNO 3 : 25g / L, 50﹪Mn(NO3) 2 : 4g / L. Phosphating solution pH value: 2.4-2.8, free acidity: 5.2 points, total acidity: 98 points.

[0058] Using this phosphating solution to phosphate carbon steel, the specific steps are:

[0059] (1) The carbon steel substrate sample is cleaned and pretreated; the steps of cleaning and pretreatment are: (a) NaOH is 4g / L...

Embodiment 2

[0064] The phosphating solution was prepared in the same manner as in Example 1,

[0065] The obtained phosphating solution in terms of parts by weight of each component in parts by weight is:

[0066] ZnO: 9g / L, 85%H 3 PO 4 : 70g / L, hydroxylamine sulfate (HAS): 14g / L, NaNO 3 : 40g / L, 50﹪Mn(NO3) 2 : 8g / L. In this embodiment, the pH value of the phosphating solution is 2.4-2.8, the free acidity is 4.7 points, and the total acidity is 90 points.

[0067] The phosphating process is: the steps of the cleaning pretreatment of the present embodiment are: (a) 10g / L and Na in NaOH 2 SiO 3 The carbon steel substrate was ultrasonically cleaned in a solution of 2 g / L for 5 minutes to remove part of the grease on the surface of the substrate; (b) the carbon steel substrate was immersed in an ethanol solution with a mass percentage of 95% for ultrasonic cleaning for 3 minutes: (c) ultrasonic cleaning in distilled water Carbon steel substrate for 4 min; (d) drying at room temperature...

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Abstract

The invention discloses an ultrasonic phosphating solution for carbon steel, a preparation method thereof and a method for phosphating the carbon steel by adopting the phosphating solution. The ultrasonic phosphating solution is prepared from the following raw materials: 5-20 g/L ZnO, 85% of 50-80 g/L H3PO4, 2-14 g/L hydroxylamine sulphate, 20-50 g/L NaNO3 and 50% of 2-12 g/L Mn(NO3)2. The method disclosed by the invention can be used for reducing the porosity of the surface of a phosphating film, enhancing the corrosion resistance of the phosphating film, improving the surface characteristics of the phosphating film and enabling the phosphating film to have an anti-scaling effect by refining granules.

Description

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Claims

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Application Information

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Owner TIANJIN UNIV
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