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Chemical conversion film formation-evaluating liquid for steel

A chemical conversion film and steel technology, applied in the direction of using chemical indicators for analysis, scientific instruments, optical testing flaws/defects, etc., can solve the problems that do not mention the mixing ratio of iron reagent solution and phenolphthalein solution, and achieve the evaluation of uniformity Effect

Inactive Publication Date: 2008-10-29
NHK SPRING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But, in non-patent literature, there is no mention about the mixing ratio of iron reagent solution and phenolphthalein solution

Method used

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  • Chemical conversion film formation-evaluating liquid for steel
  • Chemical conversion film formation-evaluating liquid for steel
  • Chemical conversion film formation-evaluating liquid for steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] figure 1 It shows the case where the defect part of the chemical conversion coating was intentionally formed by masking after shot peening. Such as figure 1 As shown, the zinc phosphate chemical conversion coating 2 is formed on almost the entire surface of the steel material 1 through zinc phosphate treatment. In addition, the thin oxide film 3 formed after shot peening remains by masking a part of the steel material 1 .

[0031] Here, the steel wire section shown in the illustration is only a schematic diagram showing the chemical conversion coating and the structure of the steel material, but actually the end surface of the steel wire is also covered with the chemical conversion coating. When this steel coil spring was immersed in the evaluation solution and then dried, no color development was confirmed on most surfaces. However, a part of the surface was colored blue, and the part that had not been chemically converted was colored pink by masking. The blue colo...

Embodiment 2

[0035] figure 2 The case where there is no chemical conversion coating on the surface of the steel material 4 and the whole surface is shot-peened as shown is shown. At this time, a thin oxide film 5 is directly formed on the surface of the steel material 4 . Here, the cross-section of the steel wire shown in the figure only shows the structure of the oxide film and the steel material, but actually the end surface of the steel wire is also covered with the oxide film. At this time, for example, if figure 2 As shown, impressions 6 are partially produced during winding. At this time, the residual deformation in this part is relatively large, and it is in a state where iron is easily precipitated compared with other parts.

[0036] When the coil spring having the above structure was dipped in the evaluation solution and then dried, mainly the portion where the imprint 6 was present was colored blue, and most of the portions other than the portion where the imprint 6 was pres...

Embodiment 3

[0039] image 3 It shows the case where the surface of the steel material 7 is subjected to the zinc phosphate chemical conversion treatment, and the zinc phosphate chemical conversion film 8 is formed on the entire surface. A part of the steel material 7 has an imprint 9 when the coil spring was wound, and thus is in a state of large residual deformation. Here, the steel wire section shown in the illustration is only a schematic diagram of the structure of the chemical conversion coating and the steel material, but actually the steel wire section is also covered with the chemical conversion coating.

[0040] The coil spring having the above configuration was immersed in the evaluation liquid and dried, and a very small part of the coiled spring was dispersed and developed a blue color. The reason for this is considered to be the result that the iron composition of the chemical conversion coating is not uniform or the residual deformation is not uniform, although it is a slig...

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Abstract

A chemical conversion film formation-evaluating liquid for steel comprising an iron-dissolving liquid and a pH indicator, wherein pH value of the evaluating liquid is confined within the range of 4.0-8.0 with a lower limit of pH transition interval of the pH indicator being larger than the pH value, as a whole, of the evaluating liquid by a value of 0.1-3.0.

Description

technical field [0001] The present invention relates to a chemical conversion film formation evaluation solution for steel for detecting a chemical conversion treated portion of the surface of a steel material that has not undergone chemical conversion treatment. Background technique [0002] In order to improve corrosion resistance, steel materials used in corrosive environments are often coated. In addition, when the corrosive environment is severe, in order to improve the adhesion of the coating film to the steel and the corrosion resistance after coating, chemical conversion treatment is performed as a pre-treatment of coating. For example, the chemical conversion treatment of zinc phosphate has been widely used for decades. However, due to various influences such as stirring conditions of the treatment liquid, temperature, acidity ratio, and adhesion of dirt on the steel surface, so-called chemical conversion coating defects may occur on the steel surface where no chem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/88
CPCG01N31/22G01N17/006G01N33/205G01N31/221
Inventor 力丸泰一铃木健小野芳树
Owner NHK SPRING CO LTD
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