Passivation solution

A technology of passivation solution and sodium hydroxide, applied in the field of passivation solution, can solve the problems of hydrogen embrittlement of substrate and insufficient anti-corrosion performance of passivation solution, and achieve the effect of improving anti-corrosion performance and good anti-corrosion performance.

Inactive Publication Date: 2012-07-11
温州神一轴业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem to be solved by the present invention is to improve the problems in the background technology that the ant...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment 1: Take 1000g of pure water, add 17.75g of sodium hydroxide, 19.65g of sodium phosphate, 48g of phosphoric acid, and 96g of potassium dichromate. Stir it until completely dissolved and let it stand for half an hour. The passivation solution of this embodiment is used to passivate the martensitic stainless steel. Since the passivation treatment process is a common method for those skilled in the art, it will not be described in detail here. The passivated martensitic stainless steel of this embodiment is subjected to a salt spray test at a concentration of 5% sodium chloride and a temperature of 35° C. It can withstand 57 hours without corrosion, and its anti-corrosion performance is good. In addition, The passivation solution described in the present invention will not cause hydrogen embrittlement to martensitic stainless steel, will not cause adverse effects on other properties of martensitic stainless steel, so that the anti-corrosion performance of martens...

Embodiment 2

[0010] Embodiment two: sodium hydroxide 19.75g, sodium phosphate 21.65g, phosphoric acid 52g, potassium dichromate 104g. Stir it until completely dissolved and let it stand for half an hour. The passivation solution of this embodiment is used to passivate the martensitic stainless steel. Since the passivation treatment process is a common method for those skilled in the art, it will not be described in detail here. The passivated martensitic stainless steel of this embodiment is subjected to a salt spray test at a concentration of 5% sodium chloride and a temperature of 35°C. It can withstand 59 hours without corrosion, and its anti-corrosion performance is good. In addition, The passivation solution described in the present invention will not cause hydrogen embrittlement to martensitic stainless steel, will not cause adverse effects on other properties of martensitic stainless steel, so that the anti-corrosion performance of martensitic stainless steel is improved while its s...

Embodiment 3

[0011] Embodiment three: sodium hydroxide 18.25g, sodium phosphate 20.15g, phosphoric acid 49g, potassium dichromate 98g. Stir it until completely dissolved and let it stand for half an hour. The passivation solution of this embodiment is used to passivate the martensitic stainless steel. Since the passivation treatment process is a common method for those skilled in the art, it will not be described in detail here. The passivated martensitic stainless steel of this embodiment was subjected to a salt spray test at a concentration of 5% sodium chloride and a temperature of 35°C. It could withstand 58 hours without corrosion, and its corrosion resistance was good. In addition, this The passivation solution described in the invention will not cause hydrogen embrittlement to the martensitic stainless steel, and will not cause adverse effects on other properties of the martensitic stainless steel, so that the anti-corrosion performance of the martensitic stainless steel is improved...

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PUM

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Abstract

The invention relates to a passivation solution. The passivation solution comprises a solvent and a solute, wherein the solvent is water; and 18.75+/-1g of sodium hydroxide, 20.65+/-1g of sodium phosphate, 50+/-2g of phosphoric acid and 100+/-4g of potassium dichromate are added into each 1,000g of water. A micro shaft made of a martensitic stainless steel material can be subjected to a salt spray test at the temperature of 35 DEG C under the condition of 5 percent sodium chloride and cannot be corroded within about 60 hours after being passivated by the passivation solution, and the passivation solution has high corrosion resistance; and in addition, a substrate cannot be subjected to hydrogen embrittlement by the passivation solution, and the passivation solution does not have any adverse effect on other performance of the substrate, so that the strength of the substrate is still kept unchanged while the corrosion resistance of the substrate is improved.

Description

technical field [0001] The invention relates to a passivation solution, in particular to a passivation solution for metal surface treatment. Background technique [0002] Passivation solution is a solution that can make the metal surface passive. Generally used for post-plating treatment of galvanized, cadmium and other coatings. The purpose is to form a surface state on the surface of the coating that can prevent the normal reaction of the metal, improve its corrosion resistance, and increase the appearance of the product. The main components of commonly used passivation solutions are chromic acid, nitric acid, and sulfuric acid. However, due to the environmental pollution caused by chromic acid, the use of low or medium concentration chromic acid passivation solution in recent years can also meet the general product requirements. In some occasions, the product requires silvery white or blue-white, and the iridescent passivation film formed after three-acid passivati...

Claims

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Application Information

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IPC IPC(8): C23C22/33
Inventor 邱鹏清
Owner 温州神一轴业股份有限公司
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