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A kind of preparation method of wear-resistant and sealing chromium plating layer of narrow ring plane structure

A planar structure, chromium plating technology, applied in the direction of electrolytic components, electrolytic process, cells, etc., can solve the problems of poor uniformity of plating thickness, uneven distribution of power lines, and failure to meet sealing requirements, etc., achieve high hardness, improve uniform thickness, and excellent The effect of abrasion resistance

Active Publication Date: 2022-05-24
XIAN SPACE ENGINE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After consulting a large amount of data and using simulation parts to carry out verification tests, the existing hard chromium plating process for steel parts deposits chromium coatings on narrow ring planes, the distribution of electric force lines is extremely uneven, resulting in poor uniformity of coating thickness, and the coating is "U" shaped, which cannot Meet the sealing requirements under high pressure, high speed, and high temperature difference, which seriously affects the normal delivery and use of the product

Method used

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  • A kind of preparation method of wear-resistant and sealing chromium plating layer of narrow ring plane structure
  • A kind of preparation method of wear-resistant and sealing chromium plating layer of narrow ring plane structure
  • A kind of preparation method of wear-resistant and sealing chromium plating layer of narrow ring plane structure

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preparation example Construction

[0040] like Figure 1-5 As shown, a method for preparing a wear-resistant and sealing chromium plating layer with a narrow ring plane structure, the steps of the method include:

[0041] The first step is to prepare auxiliary cathode A, auxiliary cathode B and auxiliary cathode C. The materials of the prepared auxiliary cathode A and auxiliary cathode B are the same as those of the narrow-ring planar structure to be plated. The auxiliary cathode C is an insulating material, and the auxiliary cathode is an insulating material. A is a ring structure with steps on the inner surface, and the auxiliary cathode A is a ring structure with steps on the inner surface. The large diameter of the steps is The trail is That is, the inner surface of the auxiliary cathode A forms a step, and the inner diameter of the auxiliary cathode A with the outer diameter of the narrow ring planar structure to be plated Matching, the auxiliary cathode A can be sleeved on the outside of the narrow...

Embodiment 1

[0056] A method for preparing a wear-resistant and sealing chromium plating layer with a narrow ring plane structure, the steps of the method include:

[0057] The first step is to prepare auxiliary cathode A, auxiliary cathode B and auxiliary cathode C. The materials of the prepared auxiliary cathode A and auxiliary cathode B are the same as those of the narrow-ring planar structure to be plated. The auxiliary cathode C is an insulating material, and the auxiliary cathode is an insulating material. A is a ring structure with steps on the inner surface, that is, the inner surface of the auxiliary cathode A forms steps, the inner diameter of the auxiliary cathode A matches the outer diameter of the narrow-ring planar structure to be plated, and the auxiliary cathode A can be sleeved on the inner surface of the auxiliary cathode A to be plated. On the outside of the clad narrow ring planar structure, the auxiliary cathode B is a stepped solid cylinder, the outer diameter of the l...

Embodiment 2

[0073] A method for preparing a wear-resistant and sealing chromium plating layer with a narrow ring plane structure, the steps of the method include:

[0074] The first step is to prepare auxiliary cathode A, auxiliary cathode B and auxiliary cathode C. The materials of the prepared auxiliary cathode A and auxiliary cathode B are the same as those of the narrow-ring planar structure to be plated. The auxiliary cathode C is an insulating material, and the auxiliary cathode is an insulating material. A is a ring structure with steps on the inner surface, that is, the inner surface of the auxiliary cathode A forms steps, the inner diameter of the auxiliary cathode A matches the outer diameter of the narrow-ring planar structure to be plated, and the auxiliary cathode A can be sleeved on the inner surface of the auxiliary cathode A to be plated. On the outside of the clad narrow ring planar structure, the auxiliary cathode B is a stepped solid cylinder, the outer diameter of the l...

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Abstract

The invention belongs to the technical field of electrochemical surface treatment, in particular to a process method for preparing a wear-resistant and sealing thick chromium layer on the surface of a tool steel with a narrow ring plane structure. The auxiliary cathode not only has the function of shielding the non-plating surface, but also improves the uniformity of the thickness of the plating layer. During the chrome plating process, a stepwise feeding method is adopted, that is, the chrome plating current is gradually given from 0 to the calculated value, and the bath temperature, chrome plating current density and The distance between the cathode and the anode, the hardness value of the coating is kept between HV700~HV800 and there is no crack on the surface, so that it has high hardness, excellent wear resistance and good sealing performance.

Description

technical field [0001] The invention belongs to the technical field of electrochemical surface treatment, in particular to a process method for preparing a wear-resistant and sealing thick chromium layer on the surface of a tool steel with a narrow ring plane structure. The thickness of the prepared chromium coating is more than 200μm, and the thickness difference is not more than 10%, which can meet the requirements of wear-resistant sealing under high pressure, high speed, and high temperature difference conditions. The structure is a ring structure, and the width of the ring is generally 18-22mm. Background technique [0002] A certain type of liquid rocket engine turbo pump runs smoothly under harsh conditions such as high pressure, high speed, and high temperature difference. Its sealing structure adopts end-face contact mechanical seal, which mainly relies on the high-precision end-face cooperation of the friction surface and the sealing surface formed by sliding frict...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/04C25D5/00C25D17/10C25D21/12
CPCC25D3/04C25D5/00C25D17/10C25D21/12
Inventor 薛露平杨战争刘兴斌叶晖张万欣
Owner XIAN SPACE ENGINE CO LTD