Efficient gun barrel bore chromium plating additive and plating solution thereof

Abstract

The invention discloses an efficient gun barrel bore chromium plating additive and a plating solution thereof. The additive mainly comprises methyl sulfonic salt, sodium bromide and magnesium sulfate, and the plating solution mainly comprises CrO3, H2SO4, Fe3+ and Cr3+. By applying the additive and the plating solution to gun barrel bore chromium plating, qualified rate of gun barrel bore chromium coatings can be improved significantly, current efficiency is improved and can reach 20%-27%, chromium coating deposition velocity is increased and is 2-3 times of that of traditional hard chromium plating, gun barrel bore chromium plating time is shortened, and energy consumption in the chromium plating process is reduced. In the aspect of chromium coating performances, chromium coating hardness is enhanced beneficially, chromium loss rate after shooting of a gun barrel is decreased, chromium coating quality is improved remarkably, the chromium coatings are fine, and bright and uniform in thickness, throwing power of the plating solution is high, cone difference is reduced, inner wall chromium plating of deep-barrel parts can be completed only one-time plating to enable cone difference thereof to meet process standards, reversing chromium plating is not needed, chromium plating efficiency is improved greatly, time is saved, and cost of deep-barrel inner wall chromium plating is lowered. The additive is fluoride-free, small in anodic corrosion and capable of effectively protecting anodes.

Description

technical field [0001] The invention belongs to the field of chrome plating in the electroplating technology, in particular, it relates to an additive and a plating solution for the chrome plating process of the inner bore of a gun barrel and the chrome plating process of the inner wall of a deep pipe part. Background technique [0002] When the bullets of various rifles, submachine guns, machine guns, and pistols are fired, the inner bore of the barrel must bear the effects of high-temperature ablation, high-pressure gunpowder gas impact, and chemical corrosion of high-temperature gunpowder gas. Small and difficult to maintain, the impurities and corrosive substances remaining on the inner wall of the barrel make the barrel very easy to rust, causing serious damage to the barrel and affecting the shooting accuracy and lethality of the firearm. Chromium-plating the inner bore of the barrel can effectively improve the anti-corrosion performance of the barrel, reduce the frict...

AI Technical Summary

Problems solved by technology

Although the reversing chrome plating solves the problem of the taper difference of the chrome plating layer to a certain extent, because the reversing chrome plating needs to reverse the direction of the barrel, the workload of the barrel loading and unloading fixture increases, which seriously restricts the work efficiency and the chrome plating time is prolonged. At the same time, the same part needs two sets of fixtures to complete the first and second plating, which greatly increases the cost

Due to two times of chrome plating, the integrity of the chrome layer is poor, and the two chrome plating makes the interface of the chrome layer have obvious joints, which greatly reduces the impact resistance of the chrome layer