Nickel-phosphorus alloy plated steel cylinder and plating method thereof

Abstract

The invention relates to a nickel-phosphorus alloy plated steel cylinder comprising a cylinder body, an amorphous state nickel-phosphorus anticorrosive layer is plated on the inner wall of the cylinder body; and the thickness of the amorphous state nickel-phosphorus anticorrosive layer is 3-8 micrometers. A plating method of the nickel-phosphorus alloy plated steel cylinder comprises the following steps of: (1) processing a steel cylinder to be plated, that is to say, sequentially washing with water, washing with acids, washing with water, activating and preheating; (2) carrying out chemical plating on the steel cylinder, placing the steel cylinder into chemical plating equipment, wherein a plating solution is prepared from nickel sulfate, sodium hypophosphite, a complexing agent A, a complexing agent B, a buffering agent A, a buffering agent B, a stabilizer and deionized water, the temperature of the plating solution is controlled between 85 DEG C and 95 DEG C, and plating time lasts till the thickness of the amorphous state nickel-phosphorus anticorrosive layer deposited on the inner wall of the steel cylinder reaches 3-8 micrometers; (3) soaking the steel cylinder subjected to the chemical plating in a Na2CO3 water solution with the concentration of 30-50 g / L at room temperature, then soaking in the deionized water at 85-95 DEG C, and then naturally drying the steel cylinder.

Description

technical field [0001] The invention relates to a steel cylinder (also known as a gas cylinder) for containing various gases (nitrogen, oxygen, natural gas, etc.) and an anticorrosion method thereof. Background technique [0002] In view of the small diameter of the steel cylinder, the large length-to-diameter ratio, and the rough surface of the inner wall, the anti-corrosion (rust prevention) treatment of the inner wall of the steel cylinder has always been a difficult problem. Regarding the anti-corrosion treatment of the inner wall of the steel cylinder, there are mainly two stages, involving two methods: 1. The surface of the inner wall is dripping paint. From the end of the 1980s to the mid-1990s, the inner wall surface of the gas cylinder is generally directly treated by the manufacturer according to the needs. For treatment, the method of dripping anti-rust primer on the surface of the inner wall is usually used. Practice has proved that there will be no problem in th...

AI Technical Summary

Problems solved by technology

Although the corrosion resistance of the steel cylinder after phosphating treatment has been improved, it can only play the role of anticorrosion in a short time. As time goes by, white phosphating powder will be produced on the inner wall of the steel cylinder, and the phosphating powder will be released with the gas. Into the pipeline damage control valve parts, if repeated phosphating, the cylinder is prone to hydrogen fragmentation, affecting the safety of use

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