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Surface nickel coating grain size regulating method capable of improving corrosion resistance

A technology of corrosion resistance and nickel coating, which is applied in the field of nickel coating grain size control and Ni coating to improve the corrosion resistance of alloys. control and other problems, to achieve the effect of dense coating, high hardness and uniform structure

Inactive Publication Date: 2016-04-20
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the traditional electroplating nickel coating process often achieves nano-sized nickel coatings by adding grain refiners such as saccharin. , easily lead to segregation of impurity elements, such as the addition of saccharin will lead to grain boundary segregation of sulfur element, sulfidation embrittlement, which will lead to deterioration of alloy properties
The patent number is CN104562111A, and the electroplated Ni-Cr coating introduced in "A Method of Improving the Corrosion Resistance of Nickel-Aluminum Bronze" has unsustainable increase in thickness, uncontrollable Cr content, and there are many additives in the electroplating solution Defects that affect the quality of the coating

Method used

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  • Surface nickel coating grain size regulating method capable of improving corrosion resistance
  • Surface nickel coating grain size regulating method capable of improving corrosion resistance
  • Surface nickel coating grain size regulating method capable of improving corrosion resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This example relates to an electroplating method for obtaining a micron-scale nickel coating by direct current electroplating. The method includes the following steps:

[0041] Step 1: The surface of the nickel-aluminum-bronze alloy is polished by 180#—400#—800#—1200# water sandpaper machine in turn, and then in the configured degreasing liquid (including 30g / LNaOH, 35g / LNa 2 CO 3 , 40g / LNa 3 PO 4 ) Keep at 70°C for 1 min, remove residual grease, rinse with water, and set aside;

[0042] Step 2: Put the processed nickel aluminum bronze at 100mL / LH 2 SO 4 After pickling and activation, rinse with water and dry with cold air and immediately place it in the following plating solution:

[0043]

[0044] Heat the electrolyte temperature to 50±1℃; adjust its pH value to 4.0±0.2 with ammonia water; Direct current The current density is 5A / dm 2 ; The plating time is 60min;

[0045] Step 3: Take out the electroplated nickel-aluminum bronze alloy, rinse it with deionized water, and dry i...

Embodiment 2

[0048] This example relates to an electroplating method for obtaining a submicron nickel coating by pulse electroplating. The method includes the following steps:

[0049] Step 1: The surface of the nickel-aluminum-bronze alloy is polished by 180#—400#—800#—1200# water sandpaper machine in turn, and then in the configured degreasing liquid (including 30g / LNaOH, 35g / LNa 2 CO 3 , 40g / LNa 3 PO 4 ) Keep at 70°C for 1 min, remove residual grease, rinse with water, and set aside;

[0050] Step 2: Use 100mL / LH for the processed nickel aluminum bronze alloy 2 SO 4 After pickling and activation, rinse with water and dry it with cold air and immediately place it in the plating solution in Example 1. Heat the electrolyte temperature to 50±1℃; adjust the pH value to 4.0±0.2 with ammonia water; the applied bidirectional pulse current waveform Picture like figure 2 As shown, the forward pulse current density Ic is 2A / dm 2 , The reverse pulse current density Ia is 0.5A / dm 2 , The pulse frequency ...

Embodiment 3

[0054] This example relates to an electroplating method for obtaining a nano-scale nickel coating by pulse electroplating. The method includes the following steps:

[0055] Step 1: The surface of the nickel-aluminum-bronze alloy is mechanically polished with 180#—400#—800#—1200# water sandpaper in turn, and then 70% in the configured degreasing liquid (containing 30g / LNaOH, 35g / LNa2CO3, 40g / LNa3PO4) Keep constant temperature at ℃ for 1 min, remove residual grease, rinse with water, and then set aside;

[0056] Step 2: The treated nickel-aluminum bronze was pickled and activated with 100mL / LH2SO4, rinsed with water and dried by cold air, and immediately placed in the plating solution in Example 1. Heat the electrolyte temperature to 50±1°C; adjust it with ammonia The pH value is 4.0±0.2; the waveform of the applied pulse current is as follows Figure 4 As shown, the current density Ip is 30A / dm 2 , The pulse frequency is 500Hz, the power-on time t is 0.4ms, the power-off time t is 1...

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Abstract

The invention provides a surface nickel coating grain size regulating method capable of improving corrosion resistance, and belongs to the field of metal surface engineering, and the surface nickel coating grain size regulating method is used for improving corrosion resistance by adopting a method of electro-depositing Ni coatings with different grain sizes. By adopting a nickel aminosulfonate plating solution system, the grain sizes of the Ni coatings are regulated by controlling electro-deposition parameters in case of not adding any grain refiner. According to the invention, the Ni coatings with different grain sizes ranging from nano scale to micro scale are obtained by adopting a direct-current electro-deposition mode and a pulse electro-deposition mode. On the premise of not adding the grain refiner, the nickel coating grain refinement is realized by regulating the electro-deposition parameters, so that the corrosion resistance of the Ni coatings can be effectively improved while an impurity element segregation problem caused by the additive is avoided. The surface nickel coating grain size regulating method has the advantages such as a simple operation process, low cost, high efficiency and the like.

Description

Technical field [0001] The invention relates to surface treatment technology, in particular to a method for adjusting the grain size of a nickel coating on the surface to improve the corrosion resistance of alloys, and more specifically, to obtain Ni coatings with varying sizes from micrometers to nanometers by adjusting different electrodeposition parameters on the alloy surface. Layer method. Background technique [0002] At present, metal alloys are used in a wide range of applications, including copper alloys, magnesium alloys, titanium alloys, aluminum alloys, etc., which are mainly used in industries such as automobile manufacturing, building materials, aerospace, and offshore platforms. However, due to the defects of the alloy itself, such as component segregation, loose organization, etc., it suffers severe corrosion in corrosive environments such as moist air and ocean atmosphere, including electrochemical corrosion and chemical corrosion, which greatly reduces the servi...

Claims

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Application Information

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IPC IPC(8): C25D5/18C25D21/12
CPCC25D5/18C25D21/12
Inventor 吴忠刘磊罗芹沈彬秦真波张琪刘德荣胡文彬
Owner SHANGHAI JIAO TONG UNIV
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