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Antiwear nickel phosphor functionalized gradient plate preparation method

A functional gradient, wear-resistant nickel-phosphorus technology, applied in the field of preparation of wear-resistant nickel-phosphorus functionally gradient coatings, can solve the problems of reducing wear resistance, difficulty in achieving sufficient strength of the interface, and limiting the practical application of nickel-phosphorus alloy coatings

Active Publication Date: 2006-05-03
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

However, after high-temperature heat treatment, due to the large difference in thermal expansion coefficient between the nickel-phosphorus alloy coating and the substrate, a large number of deep cracks will be generated inside the coating, which makes it difficult for the interface to achieve sufficient strength. will significantly reduce its wear resistance
This limits the practical application of nickel-phosphorus alloy coatings in high temperature and wear-resistant applications

Method used

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Embodiment 1

[0021] The wear-resistant nickel-phosphorus functional gradient coating is prepared by electroplating, using a controllable current DC power supply. The pure nickel sheet is used as the anode during electroplating, and the steel workpiece after conventional pre-plating pretreatment is used as the cathode. The electrolyte composition of the electroplating nickel-phosphorus gradient coating is as follows: the concentration of nickel sulfate is 240g / L, nickel chloride is 30g / L, boric acid 30g / L, phosphorous acid 20g / L. Adjust the pH value of the plating solution at 1.5, and keep the temperature within the range of 65-70°C. In the above-mentioned plating solution, use dilute hydrochloric acid to adjust the pH value of the plating solution during the electroplating process to be constant, and control the current density and corresponding A functionally graded coating of amorphous nickel-phosphorus alloy with a thickness of more than 30 μm can be deposited within a short electrodepo...

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Abstract

The invention discloses a preparation method for wearable nickel phosphate function gradient plating coat, which comprises: with design idea for gradient material, using single-bath electroplating method, preparing the coat with phosphate content gradient varying by boosting current density gradually and controlling deposition time. This product has proper phosphate content gradient and thermal expansion coefficient to release the thermal stress problem and high bond strength and abrasion resistance. This method can replace current used technique.

Description

technical field [0001] The invention relates to a preparation method of a wear-resistant nickel-phosphorus functional gradient coating. Background technique [0002] The electroplated chromium coating has been widely used in the machining industry for its excellent wear resistance and corrosion resistance. grinding performance. According to the data, if there is no chrome plating process, the global loss due to wear and tear will be calculated in tens of billions of yuan. However, in the process of electroplating hard chromium, a large amount of hexavalent chromium in waste water and waste gas will cause great pollution to the environment. Hexavalent chromium can cause human kidney failure, heart failure, leukemia, and can strongly cause cancer. For this reason, the governments of various countries have adopted certain restrictive measures, and the European Union issued a directive that after July 1, 2007, the use of hexavalent chromium and its products will be banned thro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56C25D5/18
Inventor 徐洮王立平高燕薛群基梁爱民
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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