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Passivation Method for Improving Brightness of Martensitic Stainless Steel

A technology of martensitic stainless steel and brightness, which is applied in the direction of metal material coating technology, etc., can solve the problems of limiting the application and popularization of martensitic stainless steel products, the deterioration of product finish and brightness, and the low molecular density of passivation film , to achieve the effect of improving product appearance quality, improving appearance quality, and improving intermolecular compactness

Active Publication Date: 2021-08-17
SHAANXI BAOCHENG AVIATION INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the passivation film of austenitic stainless steel such as 1Cr18Ni9Ti can still retain the original color of the metal; the passivation film formed after passivation of martensitic stainless steel such as 1Cr13, 2Cr13, 3Cr13, 4Cr13 is determined by the Cr content. The passivation film formed after the passivation of the body stainless steel is generally dull gray-black; not only that, the passivation of the martensitic stainless steel products is not high in molecular density and the finish is not ideal, resulting in its Post-assembly process is easy to leave fingerprints
It can be seen that the passivation method of martensitic stainless steel under the prior art greatly limits the application of martensitic stainless steel products in daily life due to the low density of the passivation film and the poor finish and brightness of the product after passivation. and popularity

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  • Passivation Method for Improving Brightness of Martensitic Stainless Steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The passivation method for improving the brightness of martensitic stainless steel, is characterized in that, comprises the following steps:

[0026] 1) Gasoline cleaning: degreasing and cleaning the parts with ordinary gasoline;

[0027] 2) Air-drying: hang the cleaned parts for 30 minutes at a closed and dust-free room temperature under 1 atmosphere of 20°C;

[0028] 3) Chemical degreasing: dry the hanging parts in a bath composed of the following components and process parameters: 40g / L trisodium phosphate (Na 3 PO 4 ·12H 2 O) and 50g / L sodium carbonate (Na 2 CO 3 ·10H 2 The main raw material composed of 0), 5g / L sodium hydroxide (NaOH) solution auxiliary raw material formula chemical degreasing alkali solution for mild alkali degreasing on the surface of martensitic stainless steel parts; compared with sodium hydroxide (NaOH) The alkali degreasing method of the main degreasing solution can maximize the integrity of the surface of the profile; avoid metal disso...

Embodiment 2

[0036] The passivation method for improving the brightness of martensitic stainless steel, is characterized in that, comprises the following steps:

[0037] 1) Gasoline cleaning: degreasing and cleaning the parts with gasoline;

[0038] 2) Air-drying: hang the cleaned parts for 40 minutes at a closed, dust-free room temperature under 1 atmosphere of 20°C;

[0039] 3) Chemical degreasing: dry the hanging parts in a bath composed of the following components and process parameters: 50g / L trisodium phosphate (Na 3 PO 4 ·12H 2 O) and 50g / L sodium carbonate (Na 2 CO 3 ·10H 2 The main raw material composed of O), and the chemical alkali solution mixed with 10g / L sodium hydroxide (NaOH) auxiliary raw material performs mild alkali degreasing on the surface of martensitic stainless steel parts; The alkali degreasing method of the oil solution can maximize the integrity of the surface of the profile; avoid metal dissolution on the surface of the material; lay the foundation for the...

Embodiment 3

[0047] The passivation method for improving the brightness of martensitic stainless steel, is characterized in that, comprises the following steps:

[0048] 1) Gasoline cleaning: degreasing and cleaning the parts with gasoline;

[0049] 2) Air-drying: hang the cleaned parts for 60 minutes at a closed and dust-free room temperature of 1 atmosphere at 25°C;

[0050] 3) Chemical degreasing: dry the parts in a bath composed of the following components and process parameters: 60g / L trisodium phosphate (Na 3 PO 4 ·12H 2 O) and 50g / L sodium carbonate (Na 2 CO 3 ·10H 2 The main raw material composed of O), and the chemical alkali solution mixed with 15g / L sodium hydroxide (NaOH) auxiliary raw material performs mild alkali degreasing on the surface of martensitic stainless steel parts; The alkali degreasing method of the oil solution can maximize the integrity of the surface of the profile and avoid the dissolution of metals on the surface of the material; it lays the foundation ...

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Abstract

A passivation method for improving the brightness of martensitic stainless steel is provided, which consists of the following process steps: gasoline cleaning—drying—chemical degreasing—hanging—pickling—composed of chromic anhydride and sulfuric acid formula The first passivation of the composite bright passivation solution—the second passivation of the composite bright passivation solution composed of chromic anhydride and phosphoric acid—neutralization with sodium carbonate aqueous solution—drying to obtain the finished product. Using this process to process martensitic stainless steel can obtain bright and passivated martensitic stainless steel products with excellent cavitation resistance, which can meet customers’ double-standard requirements for the appearance and quality of martensitic stainless steel products. It is easy to implement and relatively Economical and practical.

Description

technical field [0001] The invention belongs to the technical field of chemical metallurgical metal material surface treatment, in particular to a passivation method for improving the brightness of martensitic stainless steel. Background technique [0002] In recent years, with the development of material manufacturing technology and the reduction of material costs, the application of stainless steel materials in production and life has become more and more extensive. At present, in order to improve the corrosion resistance of stainless steel, chemical passivation technology is generally used at home and abroad to treat it, so that a very thin passivation film is formed on the surface. However, the passivation film of austenitic stainless steel such as 1Cr18Ni9Ti after passivation can still retain the original color of the metal; while the passivation film formed after passivation of martensitic stainless steel such as 1Cr13, 2Cr13, 3Cr13, 4Cr13, etc., is determined by the C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/24C23C22/78C23G1/19C23G1/08
CPCC23C22/24C23C22/78C23G1/081C23G1/19
Inventor 付新广胡安禄王战东赵恒侯小武
Owner SHAANXI BAOCHENG AVIATION INSTR