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Rare earth chromium composite electroplating layer and preparing method and use thereof

A technology of composite electroplating and electroplating layer, applied in the direction of coating, electrolytic coating, etc., can solve the problem of small improvement and achieve the effect of reasonable process

Inactive Publication Date: 2004-04-14
王飚
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

NiCr alloy coating can improve the anti-abrasion performance of the turbine, but the increase is not large, and because it cannot solve the problem of thermal deformation after NiCr alloy spraying, most hydropower stations are still reluctant to use it as the anti-corrosion of the turbine. abrasive coating

Method used

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  • Rare earth chromium composite electroplating layer and preparing method and use thereof
  • Rare earth chromium composite electroplating layer and preparing method and use thereof
  • Rare earth chromium composite electroplating layer and preparing method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: The electroplating of rare earth chromium is carried out to the needle nozzle (heavy 65kg) and the retaining ring (heavy 17kg) of the impact turbines of Yilihe Hydropower Plant and Yuanjiang Huashiban Power Plant in Yunnan Province.

[0029] First prepare the electroplating solution, the composition of the electroplating solution is: CrO 3 (Chromic anhydride): 140g / liter, H 2 SO 4 : 1.5g / liter, soluble rare earth additive mainly composed of mixed rare earth oxides purchased by Inner Mongolia Research Institute: 2g / liter, insoluble mixed rare earth salt additive mainly composed of sulfate and carbonate purchased by Inner Mongolia Research Institute: 3g / L, and the rest is water.

[0030]The electroplating technology consists of polishing, alkali cleaning, pickling, periodic reverse-phase electroplating of rare earth chromium, and finishing processes. Among them, polishing, alkali washing, pickling, and finishing processes are all carried out according to...

Embodiment 2

[0032] Example 2: Electroplating of the anti-wear plate (φ2m) of the Xiaohedi Hydropower Plant in Yuanjiang.

[0033] First prepare the electroplating solution, the composition of the electroplating solution is: CrO 3 (Chromic anhydride): 158g / liter, H 2 SO 4 : 1.75g / liter, the soluble rare earth additive mainly composed of mixed rare earth oxides purchased by the Inner Mongolia Research Institute: 2.25g / liter, the insoluble mixed rare earth salt additive mainly composed of sulfate and carbonate purchased by the Inner Mongolia Research Institute: 3.25g / liter, the rest is water.

[0034] The electroplating process is basically the same as in Example 1, except that the temperature of the plating solution is 50°C, and the current density is 28 amps / dm 2 The rare earth chromium coating of the plated parts reaches 0.35mm.

[0035] After the above process, the rare earth chromium composite electroplating layer of the mixed rare earth chromium base phase and the second phase of m...

Embodiment 3

[0036] Embodiment 3: Electroplating the mixed-flow runner of Qujing Tianshengba Hydropower Plant.

[0037] First prepare the electroplating solution, the composition of the electroplating solution is: CrO 3 (Chromic anhydride): 170g / liter, H 2 SO 4 : 2.0g / liter, the soluble rare earth additive mainly composed of mixed rare earth oxides purchased by the Inner Mongolia Research Institute: 2.5g / liter, the insoluble mixed rare earth salt additive mainly composed of sulfate and carbonate purchased by the Inner Mongolia Research Institute: 3.5g / liter, the rest is water.

[0038] The electroplating process is basically the same as in Example 1, except that the temperature of the plating solution is 54°C, and the current density is 30 amps / dm 2 The rare earth chromium coating of the plated parts reaches 0.4mm.

[0039] After the above process, the rare earth chromium composite electroplating layer of the mixed rare earth chromium base phase and the second phase of mixed rare earth...

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Abstract

The present invention relates to a rare earth chrome composite electroplated coat, its preparation method and application. Said electroplated coat is formed from mixed rare earth chrome base phase and mixed rare earth sulfate and carbonate second phase. Said electroplating procedure includes electroplating earlier stage, middle stage and later stage, and said invention also provides its electroplating operation steps and time of every stage, and provides the composition of the electroplating solution. Said electroplated coat can be used as wear-resisting and corrosion-proofing coating of hydraulic turbine.

Description

Technical field: [0001] The invention relates to a rare earth chromium composite electroplating layer and a preparation method and application thereof, belonging to the technical field of electroplating. Background technique: [0002] It is an international scientific and technological problem that hydraulic turbines are damaged prematurely due to the combined action of cavitation erosion and sediment wear (referred to as abrasion), which hinders the full development and utilization of water energy resources. The current water turbines are mostly made of stainless steel, which are damaged earlier because of their unsatisfactory abrasion resistance (according to the water quality and working conditions of each hydropower station, some water turbine flow parts can work continuously for 1-2 years, and some water turbine flow parts It can only work continuously for 3-6 months), and the flow-passing parts need to be replaced frequently, resulting in the loss of water energy resou...

Claims

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Application Information

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IPC IPC(8): C25D3/04C25D3/56C25D5/18C25D15/00
Inventor 王飚王宇栋张自华
Owner 王飚
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