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Surface treatment method of investment precision casting

A precision casting and surface treatment technology, applied in the field of investment precision casting, can solve problems such as shortened service life, easy rust spots on the surface, and influence on dimensional accuracy, and achieve excellent antirust performance

Inactive Publication Date: 2017-01-18
GUIZHOU ANJI AVIATION PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to provide a surface treatment method for investment precision castings to solve the problem that stainless steel castings produced by investment precision casting are prone to rust spots when used in harsh environments, which affects their dimensional accuracy and shortens their service life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Electrolytic degreasing: put the casting in the electrolytic tank for 5 minutes, the temperature of the degreasing tank liquid is 80°C, specifically: put the casting as the cathode in the electrolytic tank for 7 minutes, and the current density is 10A / dm 2 ; Put the casting as an anode into the electrolytic cell to remove oil for 3 minutes, and the current density is 10A / dm 2 ; The ratio of the degreasing tank solution in the electrolyzer: NaOH of 8g / L, NaOH of 60g / L 2 CO 3 , 40g / L Na 2 PO 4 12H 2 O, 10g / L Na 2 SiO 3 ;Water washing: wash the degreasing castings with hot water at 80°C for 10 minutes, and then wash the castings with cold water at 20°C for 2 minutes; corrosion: put the washed castings in the corrosion tank for 10 minutes; Bath by H 2 SO 4 , 100g / L, HNO3, 90g / L, HF, 50g / L, mixed according to the ratio of 1:0.9:0.5 by weight, dissolved in water to form a solution with a concentration of 30%; washing: use a flowing fluid with a temperature of 20°C Ri...

Embodiment 2

[0028] Electrolytic degreasing: put the casting in the electrolytic tank for 3 minutes, the temperature of the degreasing tank liquid is 60°C, specifically: put the casting as the cathode in the electrolytic tank for 3 minutes, and the current density is 5A / dm 2 ; Put the casting as an anode into the electrolytic cell to remove oil for 1min, and the current density is 5A / dm 2 ; The ratio of the degreasing tank solution in the electrolyzer: 6g / L of NaOH, 40g / L of NaOH 2 CO 3 , 20g / L Na 2 PO 4 12H 2 O, 5g / L Na 2 SiO 3 ;Water washing: wash the degreasing castings with hot water at 60°C for 3 minutes, and then wash the castings with cold water at 10°C for 1 minute; corrosion: put the washed castings in the corrosion tank for 5 minutes; Bath by H 2 SO 4 、HNO 3 , HF are mixed according to the ratio of 1:0.8:0.5 by weight and dissolved in water to form a solution with a concentration of 12%; washing: use cold water with a temperature of 15°C to rinse the corroded casting for...

Embodiment 3

[0030] Electrolytic degreasing: put the casting in the electrolytic tank for 4 minutes, the temperature of the degreasing tank liquid is 65°C, specifically: put the casting as the cathode in the electrolytic tank for 4 minutes, and the current density is 6A / dm 2 ; Put the casting as an anode into the electrolytic cell to remove oil for 1.5min, and the current density is 8A / dm 2 ; The ratio of the degreasing tank solution in the electrolyzer: 6g / L of NaOH, 50g / L of NaOH 2 CO 3 , 30g / L Na 2 PO 4 12H 2 O, 6g / L Na 2 SiO 3 ;Water washing: wash the degreased castings with hot water at 65°C for 6 minutes, and then wash the castings with cold water at 18°C ​​for 2 minutes; corrosion: put the washed castings into the corrosion tank for 6 minutes; Bath by H 2 SO 4 、HNO 3 , HF are mixed according to the ratio of 0.5:1:0.2 by weight and then dissolved in water to form a solution with a concentration of 18%; washing: rinse the corroded casting with flowing cold water at a temperat...

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Abstract

The invention discloses a surface treatment method of an investment precision casting. The method comprises the steps of electrolytic degreasing, water washing, corrosion, flushing, electropolishing, cleaning, detection and the like. According to the surface treatment method, the processes of electrolytic degreasing, corrosion, electropolishing and the like are adopted, so that a gray dark oxide layer can be effectively removed from the surface of the casting, the surface of the casting is bright silver-white, and the casting can have excellent anti-rust performance without applying anti-rust paint or anti-rust liquid to the surface of the casting.

Description

technical field [0001] The invention relates to the technical field of investment precision casting, in particular to a surface treatment method for investment precision castings. Background technique [0002] For the castings produced by the investment casting method, the alloy liquid is poured at a high temperature, solidified and shrunk to form an as-cast casting, and the surface of the casting is oxidized and dark. Stainless steel investment precision castings are usually used in acid, alkali, and salt media, requiring good corrosion resistance and intergranular corrosion resistance, but the corrosion resistance and intergranular corrosion resistance during long-term use or in a sensitized state will be significantly reduced, and rust spots will appear on the surface of the castings, which will not only affect the dimensional accuracy of the castings, but also shorten the service life of the castings due to the existence of rust spots. At present, in order to avoid or s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/02C25F1/04C25F3/16
CPCC25F1/04C23G1/02C25F3/16
Inventor 张锋
Owner GUIZHOU ANJI AVIATION PRECISION CASTING
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