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Method for preparing single-phase nanocrystal Co-Ni-W alloy coating through electrodeposition

An alloy coating, co-ni-w technology, applied in the field of metal surface treatment, can solve problems such as deterioration of coating corrosion resistance

Active Publication Date: 2016-01-06
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the presence of the intermetallic compound Co3W will increase the hardness of the Co-W alloy coating, and it will become the initiation zone of pitting corrosion in a corrosive environment, resulting in the deterioration of the corrosion resistance of the coating.

Method used

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  • Method for preparing single-phase nanocrystal Co-Ni-W alloy coating through electrodeposition
  • Method for preparing single-phase nanocrystal Co-Ni-W alloy coating through electrodeposition
  • Method for preparing single-phase nanocrystal Co-Ni-W alloy coating through electrodeposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take a number of cold-rolled low-carbon steel plates of 10×20×1.5mm, polish the surface with metallographic sandpaper, wash them with absolute ethanol and acetone in sequence, dry them, and put them in a desiccator for later use. The treated cold-rolled low-carbon steel plate will serve as a substrate for electrodeposition.

[0033] Use deionized water to prepare the plating solution, the composition of the plating solution is: CoSO 4 ·7H 2 O0.4mol L -1 , NiSO 4 ·6H 2 O0.1mol L -1 , Na 2 WO 4 2H 2 O0.1mol L -1 , H 3 BO 3 0.06mol·L -1 , NH 4 Cl0.01mol L -1 , Na 2 SO 4 10H 2 O0.03mol L -1 , C 16 h 36 ClN0.02mol L -1 , Na 3 C 6 h 5 o 7 2H 2 O0.2mol L -1 . The pH value of the plating solution was adjusted to 7.5, and then the plating solution was left to age for 36 hours.

[0034] The previously pretreated cold-rolled low-carbon steel plate was used as the cathode, and the platinum sheet was used as the anode. The distance between the cathode and...

Embodiment 2

[0038] The cold-rolled low-carbon steel plate was processed according to the method of Example 1.

[0039] Use deionized water to prepare the plating solution, the composition of the plating solution is: CoSO 4 ·7H 2 O0.5mol L -1 , NiSO 4 ·6H 2 O0.15mol L -1 , Na 2 WO 4 2H 2 O0.2mol L -1 , H 3 BO 3 0.06mol·L -1 , NH 4 Cl0.02mol L -1 , Na 2 SO 4 10H 2 O0.03mol L -1 , C 16 h 36 ClN0.03mol L -1 , Na 3 C 6 h5 o 7 2H 2 O0.2mol L -1 . Adjust the pH value of the plating solution to 8, and then leave the plating solution to age for 36 hours.

[0040] The previously pretreated cold-rolled low-carbon steel plate was used as the cathode, and the platinum sheet was used as the anode. The distance between the cathode and the anode was 5 cm, the electrodeposition temperature was 40 ° C, and the average cathode current density was 120 mA cm -2 , the duty cycle of the pulse current is 60%, the pulse frequency is 1200Hz, the ultrasonic power is 120W, the ultrasonic f...

Embodiment 3

[0044] The cold-rolled low-carbon steel plate was processed according to the method of Example 1.

[0045] Use deionized water to prepare the plating solution, and the composition of the plating solution is the same as in Example 1. The pH value of the plating solution was adjusted to 7.5, and then the plating solution was left to age for 36 hours.

[0046] The previously pretreated cold-rolled low-carbon steel plate was used as the cathode, and the platinum sheet was used as the anode. The distance between the cathode and the anode was 5 cm, and the electrodeposition temperature was 40°C.

[0047] The average cathode current density, pulse current duty cycle, pulse frequency, ultrasonic power, ultrasonic frequency, and electrodeposition time of the electrodeposition process are the same as in Example 2.

[0048] The insulation heat treatment method is with embodiment 1.

[0049] The analysis, characterization and performance testing methods of the samples are the same as th...

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Abstract

The invention discloses a method for preparing a single-phase nanocrystal Co-Ni-W alloy coating through electrodeposition and a special coating solution. The coating solution contains CoSO4.7H2O, NiSO4.6H2O, Na2WO4.2H2O, H3BO3, NH4Cl, Na2SO4.10H2O, C16H36ClN, Na3C6H5O7.2H2O and the balance of solvent deionized water. The method comprises the following steps of regulating the pH value of the coating solution to 7.0-9.5, standing and ageing; placing the coating solution into an ultrasonic constant-temperature tank, and carrying out pulse electrodeposition; and placing the product into an atmosphere protecting furnace to carry out heat insulation treatment to finally obtain the single-phase nanocrystal Co-Ni-W alloy coating. According to the method, a Co-Ni-W ternary coating solution system is utilized and is combined with a pulse electrodeposition hand and an ultrasonic field, so that the single-phase nanocrystal Co-Ni-W alloy coating which is high in W content and is a Co solid solution is prepared, and the single-phase nanocrystal Co-Ni-W alloy coating has the favorable performances of high hardness and high corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and relates to a method for preparing an alloy coating on a metal surface, in particular to a method for preparing a single-phase nanocrystalline Co-Ni-W alloy coating on a metal surface by electrodeposition. Background technique [0002] In recent years, the environmental protection department 6+ The stricter control of waste liquid and exhaust gas restricts the application of Cr (chromium) coating. Therefore, people are committed to developing an environmentally friendly coating that can replace the Cr coating. Among many metal materials, W (tungsten) alloy exhibits excellent properties such as high melting point, high hardness and high corrosion resistance. The use of W alloy as a "substitute Cr" coating on the surface of special devices has attracted widespread attention. [0003] For Co (cobalt)-based W alloy coatings, the dominant factor that enables them to be used as a "...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56C25D5/18
Inventor 盛敏奇吕凡吴彬翁文凭
Owner SUZHOU UNIV
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