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Passivation method for improving brightness of martensitic stainless steel

A martensitic stainless steel and brightness technology, applied in the direction of metal material coating process, etc., can solve the problems of restricting the application and popularization of martensitic stainless steel products, deterioration of product finish and brightness, and 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: 2020-03-27
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 it comprises the following steps:

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

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

[0028] 3) Chemical degreasing: After hanging and drying, the parts are carried out 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 O) the main raw material of composition, 5g / L sodium hydroxide (NaOH) solution assists the chemical degreasing alkali solution that the raw material formula forms to carry out gentle 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 preserve the integr...

Embodiment 2

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

[0037] 1) Gasoline cleaning: use gasoline to degrease and clean the parts;

[0038] 2) Drying: Hang and dry the cleaned parts for 40 minutes at a closed dust-free room temperature of 20°C at 1 atmosphere;

[0039] 3) Chemical degreasing: After hanging and drying, the parts are carried out in a bath composed of the following ingredients 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 O) composed of the main raw material, and the chemical alkali solution mixed with 10g / L sodium hydroxide (NaOH) auxiliary raw material to carry out mild alkali degreasing on the surface of martensitic stainless steel parts; compared with sodium hydroxide (NaOH) The alkali degreasing method of the oil solution can preserve the integrity of the profile surface to the greatest exten...

Embodiment 3

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

[0048] 1) Gasoline cleaning: use gasoline to degrease and clean the parts;

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

[0050] 3) Chemical degreasing: the dried parts are carried out 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 carry out mild alkali degreasing on the surface of martensitic stainless steel parts; compared with sodium hydroxide (NaOH) main degreasing The alkali degreasing method of the oil solution can preserve the integrity of the profile surface to the greatest extent, avoid ...

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Abstract

The invention provides a passivation method for improving brightness of martensitic stainless steel. The passivation method comprises the process steps of gasoline cleaning, air drying, chemical degreasing, hanging, acid pickling, passivation by means of a first-time composite bright passivation solution formulated by chromic anhydride and sulfuric acid, bright passivation by means of a second-time composite bright passivation solution formulated by chromic anhydride and phosphoric acid, sodium carbonate aqueous solution neutralization and drying to obtain a finished product. According to thepassivation method, martensitic stainless steel is treated by adopting the process steps, a bright martensitic stainless steel bright passivation product with excellent cavitation resistance can be obtained, the double-standard requirements of customers on the appearance and the quality of the martensitic stainless steel product are met, and the passivation method is easy to implement, economicaland practical.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of chemical metallurgical metal materials, and in particular relates 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 cost, stainless steel materials are more and more widely used in production and life. At present, in order to improve the corrosion resistance of stainless steel, the chemical passivation process is commonly 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 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 ...

Claims

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Application Information

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