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Preparation method of saddle revolution body inner molded surface thick nickel plating profiling anode

A technology of profiling anodes and rotators, applied in the direction of electrodes, etc., can solve the problems of difficult processing of nickel plates, lack of anode dissolution, and difficulty of anodes meeting the needs of long-term nickel plating dissolution, etc., to achieve good bonding force, good deposition speed and coating quality effect

Active Publication Date: 2022-01-11
XIAN SPACE ENGINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high hardness of the nickel plate, it is difficult to process a nickel plate with a thickness greater than 3mm during sheet metal processing, and the anode made of a 3mm thick nickel plate is difficult to meet the long-term nickel dissolution requirements
During the plating process, the anode will have local dissolution and loss, and the weld will be detached.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The anode blank formed by welding the sheet metal is cast nickel according to this method, after chemical degreasing and cathode electrochemical degreasing, the H 2 SO 4 、HNO 3 , HF mixed acid solution for pickling for 5 minutes, after activation, first use 2A / dm in the cast nickel solution at 45-60 2 The current density of nickel casting 1h; then 2.5A / dm 2 The current density of nickel casting 4h; finally with 3A / dm 2 The current density of nickel casting is 4h. After casting nickel, the surface is polished and trimmed, and the process is repeated twice. A nickel layer with a thickness of 3-4mm can be obtained, and the nickel layer has a good bonding force with the anode body, without cracking and peeling, and the nickel layer does not fall off during use. The fabricated anode can work continuously for 12-15 hours when it is used for plating workpieces.

Embodiment 2

[0048] The anode blank formed by welding the sheet metal is cast nickel according to this method, after chemical degreasing and cathode electrochemical degreasing, the H 2 SO 4 、HNO 3 , HF mixed acid solution pickling for 10min, after activation, firstly use 1.5A / dm 2 The current density of nickel casting 1.5h; then 2.3A / dm 2 The current density of nickel casting 3h; finally with 3.5A / dm 2The current density of nickel casting is 4h, and after casting nickel, the surface is polished and trimmed, and the procedure is repeated three times. A nickel layer with a thickness of 5-6mm can be obtained, and the nickel layer has a good bonding force with the anode body, without cracking and peeling, and the nickel layer does not fall off during use. The fabricated anode can work continuously for 15-20 hours when it is used for plating workpieces.

Embodiment 3

[0050] The anode body formed by welding the sheet metal is cast nickel according to this method, after chemical degreasing and cathode electrochemical degreasing, it is pickled with HCl solution for 10 minutes, and after activation, it is firstly heated at 2A / dm 2 The current density of nickel casting 2h; then 2.8A / dm 2 The current density of nickel casting 4h; finally with 3.5A / dm 2 The current density of nickel casting is 4h, and after casting nickel, the surface is polished and trimmed, and the procedure is repeated three times. A nickel layer with a thickness of 6-7mm can be obtained, and the nickel layer has a good bonding force with the anode body, without cracking and peeling, and the nickel layer does not fall off during use. The fabricated anode can work continuously for 20-25 hours when it is used for plating workpieces.

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Abstract

The invention relates to a preparation method of a saddle revolution body inner molded surface thick nickel plating profiling anode. The preparation method comprises an anode manufacturing process and an anode manufacturing method. When the inner surface of a workpiece is plated, in order to ensure the area ratio of the anode to the plated workpiece, the surface area of the inner anode needs to be increased as much as possible, and the anode is generally manufactured by adopting a scheme of welding after sheet metal machining; and the thickness of a nickel plate cannot be greater than 3 mm during sheet metal machining, so that the obtained anode is difficult to meet the long-time nickel plating dissolution requirement. A proper treatment scheme is adopted, the thickness of the nickel anode is machined to a required value through a nickel casting method, and the prepared anode can meet long-time nickel plating use.

Description

technical field [0001] The invention belongs to the technical field of electrochemical surface treatment, in particular, when a thick nickel coating is prepared on the inner surface of a workpiece with a revolving internal profile structure, the coating with better surface quality, uniformity and bonding force can be obtained by using a profiling inner anode. The plan of welding after sheet metal processing is adopted to make the anode body, and then the thickness of the anode is increased by electroforming nickel to meet the long-term nickel plating demand. Background technique [0002] When a component in the new liquid rocket engine is working, high-temperature oxygen-enriched gas passes through the cavity. In order to protect the inner wall of the component, a thick nickel coating is used for protection. The inner wall of the component is a rotating saddle structure. In order to ensure the surface quality, bonding force and uniformity of the coating, a profiling inner an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D17/12C25D7/00C25D5/12C25D3/12C25D5/34C25D5/48C25F1/04
CPCC25D17/12C25D7/00C25D5/12C25D3/12C25D5/34C25D5/48C25F1/04
Inventor 刘兴斌翟绘丰杨战争权琳琳姚鹏
Owner XIAN SPACE ENGINE CO LTD
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