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Surface coating method of iron-based metal rotating seal ring for dynamic seal of mechanical end face

An iron-based metal and mechanical seal technology, applied in metal material coating process, liquid chemical plating, coating, etc., can solve problems such as seal failure, and achieve the effect of easy start and stop and high processing efficiency

Inactive Publication Date: 2012-10-31
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the defects of the above-mentioned prior art, the object of the present invention is to provide a method for coating the surface of the iron-based metal dynamic ring of the mechanical end face dynamic seal, so as to overcome the problem of seal failure during the operation of the mechanical seal

Method used

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  • Surface coating method of iron-based metal rotating seal ring for dynamic seal of mechanical end face
  • Surface coating method of iron-based metal rotating seal ring for dynamic seal of mechanical end face
  • Surface coating method of iron-based metal rotating seal ring for dynamic seal of mechanical end face

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Embodiment 1

[0020] This embodiment includes the following steps:

[0021] Step 1, preparing a composite plating solution, the composite plating solution is composed of a basic plating solution and a PTFE composite solution. The base bath consists of 24g / l NiSO 4 ·6H 2 O, 28g / l NaH 2 PO 2 ·H 2 O, 3.5 g / l of CH 3 COONa·3H 2 O, 30ml / l lactic acid, 2ml / l propionic acid, 2g / l succinic acid, 1.5mg / l Pb(Ac) 2 ·3H 2 O composition; PTFE composite solution is composed of 8g / l PTFE, 0.016g / l perfluoroalkyl quaternary ammonium iodide FC134 and 0.03g / l N-hydroxyethyl perfluorooctane sulfonamide; press before use Add the PTFE composite solution to the basic plating solution at a ratio of 1:1, and mix thoroughly to obtain a composite plating solution;

[0022] Step 2. Pretreatment of the mechanical seal dynamic ring before coating. The iron-based metal of the mechanical seal needs to be electrolytically polished in an acidic electrolyte before coating, and the micro-etching activation is comple...

Embodiment 2

[0026] This embodiment includes the following steps:

[0027] Step 1, preparing a composite plating solution, the composite plating solution is composed of a basic plating solution and a PTFE composite solution. The base bath consists of 24g / l NiSO 4 ·6H 2 O, 28g / l NaH 2 PO 2 ·H 2 O, 3.5 g / l of CH 3 COONa·3H 2 O, 30ml / l lactic acid, 2ml / l propionic acid, 2g / l succinic acid, 1.5mg / l Pb(Ac) 2 ·3H 2 Composed of O; PTFE composite solution is composed of 8g / l PTFE, 0.016g / l perfluoroalkyl quaternary ammonium iodide FC134; add PTFE composite solution to the basic plating solution in a ratio of 1:1 before use, and mix thoroughly Obtain composite plating solution;

[0028] Step 2. Pretreatment of the mechanical seal moving ring before coating. The friction surface of the mechanical seal iron-based metal such as high-speed steel moving ring needs to be electrolytically polished in an acidic electrolyte before coating, and the micro-etching activation is completed in one step t...

Embodiment 3

[0032] This embodiment includes the following steps:

[0033] Step 1, preparing a composite plating solution, the composite plating solution is composed of a basic plating solution and a PTFE composite solution. The base bath consists of 24g / l NiSO 4 ·6H 2 O, 28g / l NaH 2 PO 2 ·H 2 O, 3.5 g / l of CH 3 COONa·3H 2 O, 30ml / l lactic acid, 2ml / l propionic acid, 2g / l succinic acid, 1.5mg / l Pb(Ac) 2 ·3H 2 O composition; PTFE composite solution is composed of 8g / l PTFE and 0.03g / l N-hydroxyethyl perfluorooctane sulfonamide; add an appropriate amount of PTFE composite solution to the basic plating solution before use, and fully mix to obtain composite plating liquid;

[0034]Step 2. Pretreatment of the mechanical seal moving ring before coating. The friction surface of the mechanical seal iron-based metal such as high-speed steel moving ring needs to be electrolytically polished in an acidic electrolyte before coating, and the micro-etching activation is completed in one step to...

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Abstract

The invention discloses a surface coating method of an iron-based metal rotating seal ring for dynamic seal of a mechanical end face, which comprises the following steps: firstly preparing compound coating solution, preprocessing the rotating seal ring for mechanical sealing to enable the surface roughness Ra to be less than or equal to 0.1 microns, placing the preprocessed test-piece in the compound coating solution to coat for 1h, at last, washing the coated rotating seal ring test-piece for mechanical sealing with clear water, drying the test-piece by hot wind, and placing the test-piece in a high-temperature furnace, heating the test-piece in air, raising the temperature to 150-200 DEG C. according to heating rate of 200 DEG C per hour, preserving heat for 1h, and cooling the test-piece along with the furnace till room temperature, at last taking out the test-piece for future use. The method is high in processing efficiency, and fit for various sized and shaped mechanical end face sealing surface. The coated film has the characteristics of friction reduction, self lubrication, inadhesion, easy start and stop, wear resistance, corrosion resistance, high temperature resistance and so on.

Description

technical field [0001] The invention relates to a method for surface coating treatment, in particular to a surface coating method for a mechanical end face dynamic seal iron-based metal dynamic ring. technical background [0002] The mechanical end face dynamic seal is the most widely used contact seal in fluid machinery. When sealing, the end faces of the dynamic ring and the static ring are fitted together to form a friction pair under the action of spring preload. The sealing dynamic ring material is often made of cemented carbide, silicon carbide ceramics, high-speed steel and other materials, and the static ring material is usually made of impregnated graphite. For mechanical seals that need to be started and stopped frequently, the friction pair is often in a dry friction state during the start and stop stages, resulting in large friction force and friction torque, resulting in severe wear. Higher starting torque will cause shock vibration during start-up and shutdown...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/36
Inventor 董光能林平张东亚曾群锋
Owner XI AN JIAOTONG UNIV
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