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Electroplating liquid and technology used in electrodeposition of trngsten series noncrystalline alloy cladding material or nanometer alloy cladding material

A nanocrystalline alloy and amorphous alloy technology, applied in the field of electrochemistry and metal surface treatment, can solve the problems of poor electroless nickel-phosphorus plating thickness, hexavalent chromium pollution, and high cost

Active Publication Date: 2005-03-09
湖南纳菲尔新材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this process has a fatal shortcoming: it is the pollution of hexavalent chromium
However, the electroless nickel-phosphorus plating thickness is po

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1

[0021] ① Preparation of solution

[0022] The main raw materials: sodium tungstate, ferrous sulfate, nickel sulfate, boric acid, citrate, the preparation process: after adding half a bath of clean water, then adding the calculated amount of the main salt components of the plating solution, stirring, and adding the additives, using ammonia Adjust the pH value, add clean water to the use range, so that the plating can be tested.

[0023] ②Pretreatment of plated parts

[0024] There are chemical degreasing and electric degreasing.

[0025] ③Plating

[0026] After the plated parts are processed, they are put into the electroplating tank,

[0027] The components of the electroplating solution are:

[0028] Na 2 WO 4 (0.12mol / l)+FeSO 4 (0.056mol / l)+NiSO 4 (0.024mol / l)+H 3 cit(0.19mol / l)+H 3 BO 3 (0.16mol / l)

[0029] At current density of 5-10A / dm 2 , PH=8, electroplating at 60℃, after plating, rinse and blow dry.

[0030] ④Removal of hydrogen

[0031] After plating, t...

Example Embodiment

[0034] Example 2

[0035] ① Preparation of solution

[0036] Main raw materials: sodium tungstate, cobalt sulfate, nickel sulfate, boric acid, citrate, alcohol carboxylate, alcohol carboxylate and inorganic compounds and their mixtures.

[0037] Preparation process: After adding half tank of clean water, add the calculated amount of the main salt components of the plating solution, stir, and add the additives, adjust the pH-value with ammonia water, add clean water to the use range, and then test plating.

[0038] ②Pretreatment of plated parts

[0039] The pretreatment method according to the current electroplating process can be used.

[0040] ③Plating

[0041] After the plated parts are processed, they are put into the electroplating tank,

[0042] The components of the electroplating solution are:

[0043] Na 2 WO 4 (0.20mol / l)+CoSO 4 (0.048mol / l)+NiSO 4 (0.032mol / l)+H 3 cit(0.3mol / l)+H 3 BO 3 (0.16mol / l

[0044] At current density of 5-10A / dm 3 , PH=8, electroplating at 80℃, a...

Example Embodiment

[0049] Results of Examples 1 and 2

[0050] Composition and structure of tungsten-based amorphous alloy or nanocrystalline alloy

[0051] We carried out quantitative determination of the alloy of WFeNi and WCoNi obtained according to the process route, XRD structure analysis and SEM morphology analysis, and the obtained composition results were: (wt%)

[0052] The WFeNi coating contains 40-50% tungsten, 30-40% iron, 10-20% nickel, and 0.5-2% boron.

[0053] The WCoNi coating contains 40-50% tungsten, 30-40% cobalt, 10-20% nickel, and 0.5-2% boron.

[0054] Tungsten-based amorphous alloy or nanocrystalline alloy properties:

[0055] Microhardness: The tungsten-based alloy plated by the above method has a microhardness of 600-750Hv. After heat treatment and dehydrogenation, the microhardness can reach 1000-1300Hv.

[0056] Corrosion resistance: The coating is resistant to acid and alkali corrosion. The WCoNi coating does not change color after a neutral salt spray test for 72 hours....

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Abstract

An electro-deposited W-base non-crystal or nano-crystal alloy electroplated layer instead of the electroplated hard Cr layer is disclosed. Its electroplating liquid contains ferrous sulfate, nickel sulfate, cobalt sulfate and sodium tungstate. Its electroplating process is also disclosed.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry and metal surface treatment, in particular to a process for electrodepositing a tungsten-based series amorphous alloy or nanocrystalline alloy coating in an aqueous solution and replacing hard chrome plating. Background technique [0002] Hard chromium plating is a traditional process with a history of more than 70 years. The two most basic uses of hard chromium plating are: first, to provide a wear-resistant surface and prolong service life; second, to repair damaged parts, among which It is widely used to repair mechanical wear parts. [0003] The characteristics of hard chromium plating are: stable plating solution, easy operation, high quality coating, bright, wear-resistant, stable and other advantages. But this process has a fatal shortcoming: it is the pollution of hexavalent chromium. Hexavalent chromium is the main cause of nasal cancer and lung cancer, and the environmental pr...

Claims

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Application Information

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IPC IPC(8): C25D3/56
Inventor 何凤姣黄宇宁陆欣雷同鑫訾威高晖张大奇
Owner 湖南纳菲尔新材料科技股份有限公司
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