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Film weight measurement method for manganese phosphate film on stainless steel material surface

A technology of manganese phosphate film and determination method, which is applied in the direction of weighing by removing certain components, can solve problems such as allergies, production cost reduction, and complicated operation, so as to reduce pollution and poisoning, reduce processing costs, and achieve accurate measurement results Effect

Inactive Publication Date: 2016-03-30
CHENGDU ENGINE GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the use of chromic anhydride solution as the film removal solution has the characteristics of not hurting the metal substrate and simple and convenient operation of film removal, but chromic anhydride is an inhalation poison, a very poison for swallowing, it is easy to be absorbed by the human body, and can pass through the digestive tract , respiratory tract, skin and mucous membranes invade the human body, skin contact with chromic anhydride can cause allergies, inhalation or swallowing may cause cancer, and may cause genetic defects, all of which pose a serious threat to the health of test operators
Chromic anhydride is very water-soluble and forms dichromic acid after dissolving in water. The hexavalent chromium in it has a long-lasting and serious harm to the environment. Hexavalent chromium exceeding 10ppm has a lethal effect on aquatic organisms. Therefore, the membrane removal waste liquid must be It can only be discharged after strict treatment. If it accidentally enters the soil and natural water bodies, it will cause a wider range of harm.
In the treatment of membrane removal waste liquid, it is necessary to reduce the hexavalent chromium to trivalent chromium and then convert it to chromium hydride and then remove it by precipitation, or remove the hexavalent chromium by ion exchange method. The reduction-precipitation method is complicated to operate, and ion exchange The cost of the method is very high, which is not conducive to the reduction of production costs in large-scale production

Method used

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  • Film weight measurement method for manganese phosphate film on stainless steel material surface
  • Film weight measurement method for manganese phosphate film on stainless steel material surface

Examples

Experimental program
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Effect test

Embodiment 1

[0021] In this example, the test pieces to be tested for film weight are four 4140 stainless steel test pieces with manganese phosphate film on the surface produced in the same batch, and the dimensions are all 50×30×20mm. The four test pieces are respectively numbered as 1# ~4# test piece, film weight measurement method, the steps are as follows:

[0022] (1) Sodium hydroxide and disodium edetate are mixed with distilled water to make sodium hydroxide concentration be 150g / L, disodium edetate concentration is the mixed solution of 150g / L as membrane removal liquid;

[0023] (2) Weigh the mass of 1#~4# specimens respectively and record it as m 1 , respectively measure the total area of ​​the coating surface of 1#~4# specimens and record it as A;

[0024] (3) Submerge the 1#~4# specimens in the film removal liquid at a temperature of 22±2°C for 15 minutes, take them out, wash with distilled water to remove the film liquid, dry and remove the moisture on the surface of each spe...

Embodiment 2

[0034]In this embodiment, the test pieces to be tested for film weight are four 4135 stainless steel test pieces with manganese phosphate film on the surface produced in the same batch, and the dimensions are all 50×30×20mm. The four test pieces are respectively numbered as 1# ~4# test piece, film weight measurement method, the steps are as follows:

[0035] (1) Sodium hydroxide and disodium edetate are mixed with distilled water to make sodium hydroxide concentration be 170g / L, disodium edetate concentration is the mixed solution of 170g / L as membrane removal liquid;

[0036] (2) Weigh the mass of 1#~4# specimens respectively and record it as m 1 , respectively measure the total area of ​​the coating surface of 1#~4# specimens and record it as A;

[0037] (3) Submerge the 1#~4# specimens in the film removal liquid at a temperature of 22±2°C for 10 minutes, take them out, wash with distilled water to remove the film liquid, dry and remove the moisture on the surface of each s...

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Abstract

The invention provides a film weight measurement method for a manganese phosphate film on a stainless steel material surface. The method comprises the following steps: (1) preparing a mixed liquid of which the sodium hydroxide concentration and the ethylene diamine tetraacetic acid concentration are both 150-170g / L from sodium hydroxide and ethylene diamine tetraacetic acid by using distilled water or deionized water as a film-removing liquid; (2) measuring the mass of a to-be-tested stainless steel specimen and denoting as m1, and measuring the total area of the to-be-tested stainless steel specimen coating surface and denoting as A; and (3) removing the manganese phosphate film on the stainless steel specimen by using the film-removing liquid, washing the film-removing liquid with the distilled water or the deionized water, drying, weighing and denoting the weight as m2, calculating the film weight mA, mA=(m1-m2) / A, wherein the unit of mA is g / m<2>; the units of m1 and m2 are g; and the unit of A is m2. According to the method, the safety of film weight measurement of the manganese phosphate film on the stainless steel material surface can be improved; and the processing difficulty of the film-removing liquid is lowered.

Description

technical field [0001] The invention belongs to the technical field of chemical surface treatment, and relates to a method for measuring the film weight of a manganese phosphate film on the surface of a stainless steel material. Background technique [0002] After the stainless steel is phosphating with manganese phosphate solution, an insoluble manganese phosphate film with good adhesion can be formed on the surface of the stainless steel substrate. Manganese phosphate film can significantly improve various properties of stainless steel materials, for example, improve the oil retention and lubricity of stainless steel lubricating oil film, improve the finish, wear resistance and corrosion resistance of stainless steel surface, increase the insulation of stainless steel materials and reduce coefficient of friction, etc. [0003] The protective effect of the manganese phosphate film on the stainless steel substrate and the improvement of the substrate performance are related...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/04
CPCG01N5/04
Inventor 穆俊宏刘建胡彦彬李德川
Owner CHENGDU ENGINE GROUP