Salt bath composition in salt bath nitridation treatment of compressor blades and treatment method

Abstract

The invention discloses a salt bath composition in salt bath nitridation treatment of compressor blades and a treatment method. The salt bath composition is composed of and prepared from the followingcomponents in percentage by weight: 6%-12% of naphthalenetrisulfonic acid sodium, 16%-24% of urea, 10%-12% of difluoro bromobenzene, 5%-10% of potassium cyanate, 12%-18% of sodium cyanate, 3%-6% oflithium carbonate, 8%-12% of sodium carbonate, 10%-18% of potassium carbonate, 1%-3% of sodium hydroxide, 2%-5% of potassium hydroxide and 1%-15% of sodium chloride. The salt bath composition has thebeneficial effects that naphthalenetrisulfonic acid sodium and urea are added to the salt bath composition, the melting point in salt bath is reduced, nitridation can be performed at a lower temperature, the activity is good, the nitrogen concentration in a nitriding furnace is effectively controlled, the stability of blades is improved, the rejection rate of subsequent processing is reduced, andthe application prospects are good.

Description

Technical field [0001] The present invention relates to a salt bath nitriding treatment of compressor blades, and in particular to a salt bath composition and a treatment method for the compressor blades to perform salt bath nitriding treatment. Background technique [0002] Compressor is a driven fluid machine that promotes low-pressure gas to high-pressure gas, and is the heart of the refrigeration system. It sucks in low-temperature and low-pressure refrigerant gas from the suction pipe, drives the piston to compress it through the operation of the motor, and discharges the high-temperature and high-pressure refrigerant gas to the exhaust pipe to provide power for the refrigeration cycle. Although conventional salt bath nitriding is better than gas nitriding, the passive film on the surface of stainless steel and the presence of atoms such as alloying elements such as Cr can hinder the penetration of nitrogen. Therefore, it is necessary to use highly active salts. The bath fo...

AI Technical Summary

Problems solved by technology

Although conventional salt bath nitriding has improved compared with gas nitriding, due to the existence of passivation film on the surface of stainless steel and the existence of atoms such as alloy elements Cr, which hinder the infiltration of nitrogen, it is necessary to use highly active salt The bath formula can meet the required technical requirements, the production cost is high, the subsequent processing is difficult, the scrap rate is high, and the seepage layer is brittle. In view of the problems in the related technology, a salt bath nitriding treatment for compressor blades is designed. Bath Compositions and Treatment Methods