Liquid formula for preventing metal housing of pressure sensor from being oxidized and treatment process

Abstract

The invention discloses a liquid formula for preventing a metal housing of a pressure sensor from being oxidized and a treatment process. The liquid formula is prepared from the following raw materials by weight: 30 g of citric acid with the concentration of 5% and 30 g of boric acid with the concentration of 5%. Through the arrangement of a wet blasting sand storage tank, before nickel plating of a stainless steel shell, a second transfer pump in the wet blasting sand storage tank operates, wet blasting sand in the wet blasting sand storage tank is sprayed to the surface of the stainless steel shell through a spraying transverse pipe, so that the metal surface is clean, metal surface defects are removed, and the coating binding force is improved; and after oxidation liquid is prepared in an oxidation liquid preparation box, a first transfer pump in the oxidation liquid preparation box operates, the oxidation liquid in the oxidation liquid preparation box is sprayed on the surface of the stainless steel shell from an oxidation liquid shower head, and the follow-up oxidation phenomenon can be prevented through the combination of the two modes, so that a nickel-plated layer is well attached to the surface of the stainless steel shell.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of metal shells of pressure sensors, and in particular relates to a liquid formula and a treatment process for preventing oxidation of metal shells of pressure sensors. Background technique [0002] -253℃~+650℃ pressure sensor metal casing is widely used in aerospace, ships, ships, etc., mainly used in booster cylinders, boosters, gas-liquid booster cylinders, gas-liquid boosters, presses and some special In the field of detection and other fields, the pressure sensor is characterized by its ability to withstand extremely low low temperature and high temperature, and can withstand gas pressure above 20MPa, and the metal shell needs to ensure good corrosion resistance, and the surface needs to be treated with corrosion resistance. [0003] The pressure sensor uses a stainless steel shell, and a dense oxide film is easily formed on the surface of the stainless steel shell. Under the influe...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a liquid formula and treatment process to prevent oxidation of the metal shell of the pressure sensor, so as to solve the problem that the nickel-plated layer of the traditional stainless steel shell proposed in the above-mentioned background technology cannot form a good adhesion. Issues Affecting Corrosion Resistance and Sealing of Housings

Images