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Steel product excellent in corrosion resistance and corrosion fatigue resistance, and surface treatment method therefor

A corrosion resistance and surface treatment technology, applied in the direction of metal material coating process, can solve the problems of complex process, high production cost, hydrogen embrittlement and reduced material strength

Inactive Publication Date: 2007-03-07
NHK SPRING CO LTD
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  • Application Information

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Problems solved by technology

[0007] Therefore, the object of the present invention is to provide a steel material excellent in corrosion resistance and corrosion fatigue resistance and a surface treatment method thereof, which can replace conventional surface treatment methods such as electroplating, chemical conversion coating, and molten alloy plating. , Solve the problems of high production cost, complicated process, hydrogen embrittlement and reduced material strength

Method used

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  • Steel product excellent in corrosion resistance and corrosion fatigue resistance, and surface treatment method therefor
  • Steel product excellent in corrosion resistance and corrosion fatigue resistance, and surface treatment method therefor

Examples

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no. 1 approach

[0016] 1. According to the first embodiment of the present invention, a steel material excellent in corrosion resistance and corrosion fatigue resistance has a coating film on its surface, and in the average composition of the coating film, the number of Al atoms has a significant effect on Fe, The ratio of the total number of C, Al, P, O atoms and optionally added Si, Mn, Cr atoms is 0.5% or greater, and the number of Al atoms in the average composition of the coating film is greater than that in the average composition of the steel before surface treatment. number of atoms.

no. 2 approach

[0017] 2. According to the second embodiment of the present invention, a steel material excellent in corrosion resistance and corrosion fatigue resistance has a coating film on its surface, and in the average composition of the steel material surface to a region up to a depth of 5 μm, Al atoms The ratio of the number to the total number of Fe, C, Al, P, O atoms and optionally added Si, Mn, Cr atoms is 0.5% or more.

[0018] In the above two items of 1 and 2 of the present invention, "the ratio of the number of Al atoms to the total number of Fe, C, Al, P, O atoms and optionally added Si, Mn, Cr atoms" is based on elemental analysis , it is sufficient to measure the area from the steel surface to a depth of 5 μm for analysis. This area may be the cover film alone, or a combination of cover film and base material. "Si, Mn, Cr optionally added" means that none of these elements is added or at least one of these elements is added.

[0019] In item 2 of the present invention, the...

Embodiment

[0043] Some examples will be described below, but the present invention is not limited to these examples.

[0044] Take steel SAE 9254 (Fe-0.56%C-1.42%Si-0.75%Mn-0.68Cr) with a diameter of 4mm and a length of 20-80mm, and its surface is treated under various conditions in Table 1. The thick and dense oxidized rust is removed by spraying in advance to obtain the steel material used. The pretreatment step involves rinsing the steel with distilled water, desmutting it with acetone, and then immersing it in dilute aqueous hydrochloric acid to remove rust again. Then immerse the steel material to be surface treated in the treatment solution according to various conditions in Table 1, wash it with distilled water, and allow it to dry by itself (indicated by "-" in the row of 50°C drying in Table 1). The acidity ratio is controlled by adding an aqueous sodium hydroxide solution to the treatment solution. If necessary, after immersion in the treatment solution, the steel was dried i...

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Abstract

The invention provides a steel product excellent in corrosion resistance and corrosion fatigue resistance, comprising a coating film on the surface of the steel product, wherein a ratio of the number of Al atoms to the total number of Fe, C, Al, P and O atoms and optionally added Si, Mn and Cr atoms is 0.5% or more in an average composition of the coating film, and the number of Al atoms in the average composition of the coating film is higher than the number of Al atoms in an average composition of the steel product before surface treatment.

Description

technical field [0001] The present invention relates to a steel material excellent in corrosion resistance and corrosion fatigue resistance and a surface treatment method thereof. Background of the invention [0002] It is well known that, in many cases, the composition of steel materials used in corrosive environments is adjusted, or a coating film is formed on the surface using methods such as surface treatment. Its purpose is to prevent deterioration of static strength and reduction of fatigue strength due to corrosion thinning and appearance of corrosion spots, and to prevent deterioration of appearance due to rust. [0003] However, there is a problem that both product cost and production cost are increased due to the addition of corrosion-resistant elements such as Cr, Ni, Mo, etc. or increasing the content of these elements to control the composition. Another method is to form a zinc film for protection by so-called sacrificial corrosion, in which case a sacrificial ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/167C23G1/02
CPCC23C22/20C22C38/02C22C38/04C22C38/06C22C38/18
Inventor 铃木健小野芳树井海和也
Owner NHK SPRING CO LTD
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