Efficient gun barrel bore chromium plating additive and plating solution thereof

An additive and high-efficiency technology, applied in weapon accessories, offensive equipment, etc., can solve the problems of the reduction of the impact resistance of the chrome layer, the restriction of work efficiency, and the prolongation of chrome plating time. Effect

Inactive Publication Date: 2013-05-29
欧忠文 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Prepare two tanks of common chrome plating solution, add the additive of the present invention in No. 1 tank, the addition is 15~30ml / L; No. 2 tank does not add additive. A WQ347 gun barrel with an inner diameter of 7.62mm and a length of 425mm was used as a plated piece. After electrolytic degreasing, water washing, acid activation, and ultrasonic cleaning, chromium was electroplated in No. 1 tank and No. 2 tank respectively. Among them, the chrome-plated anode is lead-plated steel wire, at a temperature of 55-65°C, and a current density of 35-45A / dm 2 Plating under the conditions of 60min. After testing, the current efficiency of No. 1 tank is 27%, and the average thickness of chromium plating layer is 87μm, while that of No. 2 tank is only 9%, and the average thickness of chrome plating layer is 26μm. It has been greatly improved, thereby reducing the power consumption in the chrome plating of the inner bore of the gun barrel, and reducing the cost of chrome plating...

Embodiment 2

[0027] A steel pipe with a length of 30 cm and an inner diameter of 6 mm is used as the cathode to simulate chrome-plating on the inner wall of deep pipe parts, and a lead-plated steel wire with a diameter of 3 mm is used as the chrome-plated anode. Liquid, CrO 3 Concentration 180~200g / L, H 2 SO 4 The concentration is 2~3g / L, the electrolytic iron plate makes the Fe in the plating solution 3+ The content is 2~4g / L, the temperature is 48~52℃, the current density is 35~40A / dm 2 Electroplating is carried out under the condition of electroplating, and after electroplating for 90 minutes, the thickness of the chromium plating layer at both ends of the steel tube is measured with an inner diameter micrometer, and the taper difference is calculated to be 9 μm; 3 Concentration 180~200g / L, H 2 SO 4 The ordinary plating solution with a concentration of 2-3g / L was used as a comparison plating solution, and electroplating was carried out under the same process conditions, and the tap...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/04F41A21/12
Inventor 欧忠文胡国辉刘军蒲滕
Owner 欧忠文
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