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Surface alloying control method for improving corrosion resistance of nickel-aluminum bronze

A surface alloying and nickel-aluminum bronze technology, which is applied in the field of surface treatment and surface alloying to improve the corrosion resistance of nickel-aluminum bronze alloys, can solve the problems of corrosion resistance, easy falling off, corrosion of the substrate, etc. Simple effect of plating and heat treatment process

Inactive Publication Date: 2016-05-11
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the prior art, although the co-deposited Ni-Cu alloy coating can effectively improve the corrosion resistance of the substrate surface, it has certain limitations in controlling the Cu-Ni content ratio, and the Cu-Ni content ratio has a significant effect on the surface layer. Corrosion resistance has a great influence; the combination between the co-deposited Ni-Cu alloy coating and the nickel-aluminum bronze substrate is a mechanical bond, which is easy to fall off under high shear stress, thereby corroding the substrate

Method used

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  • Surface alloying control method for improving corrosion resistance of nickel-aluminum bronze
  • Surface alloying control method for improving corrosion resistance of nickel-aluminum bronze
  • Surface alloying control method for improving corrosion resistance of nickel-aluminum bronze

Examples

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Effect test

Embodiment 1

[0030] This example relates to a surface alloying control method for improving the corrosion resistance of nickel-aluminum bronze, said method comprising the steps of:

[0031] Step 1: Mechanically polish the surface of the nickel-aluminum-bronze alloy with 180#—400#—800#—1200# water sandpaper in sequence, and then degreasing liquid (containing 30g / LNaOH, 35g / LNa 2 CO 3 , 40g / LNa 3 PO 4 in aqueous solution) at 70°C for 1 min, remove residual grease, rinse with water and set aside;

[0032] Step 2: Put the treated nickel-aluminum bronze in 100mL / LH 2 SO 4 After pickling and activation, rinse with water and dry with cold air, and immediately place it in the plating solution containing the following salts:

[0033]

[0034] Heat the electrolyte temperature to 50±1°C; adjust its pH value to 4.0±0.2 with ammonia water; pulse forward current density 30A / dm 2 , the reverse current density is 0, the duty cycle is 20%, the frequency is 50Hz, and the plating time is 20min;

[...

Embodiment 2

[0039] This example relates to a surface alloying control method for improving the corrosion resistance of nickel-aluminum bronze, said method comprising the steps of:

[0040] Step 1: Mechanically polish the surface of the nickel-aluminum-bronze alloy with 180#—400#—800#—1200# water sandpaper in sequence, and then degreasing liquid (containing 30g / LNaOH, 35g / LNa 2 CO 3 , 40g / LNa 3 PO 4 in aqueous solution) at 70°C for 1 min, remove residual grease, rinse with water and set aside;

[0041] Step 2: Use 100mL / LH to treat the nickel-aluminum-bronze alloy 2 SO 4 After pickling and activation, electroplating for 20 minutes as in the electroplating parameters in Example 1;

[0042] Step 3: Take out the nickel-aluminum-bronze alloy after electroplating, rinse it with deionized water, dry it with cold air, and put it into a tube furnace;

[0043] Step 4: As in Example 1, argon gas is first passed through the tube furnace, and the heat treatment is ended after gradually raising t...

Embodiment 3

[0046]This example relates to a surface alloying control method for improving the corrosion resistance of nickel-aluminum bronze, said method comprising the steps of:

[0047] Step 1: Mechanically polish the surface of the nickel-aluminum-bronze alloy with 180#—400#—800#—1200# water sandpaper in sequence, and then degreasing liquid (containing 30g / LNaOH, 35g / LNa 2 CO 3 , 40g / LNa 3 PO 4 in aqueous solution) at 70°C for 1 min, remove residual grease, rinse with water and set aside;

[0048] Step 2: Use 100mL / LH to treat the nickel-aluminum-bronze alloy 2 SO 4 After pickling and activation, electroplating for 20 minutes as in the electroplating parameters in Example 1;

[0049] Step 3: Take out the nickel-aluminum-bronze alloy after electroplating, rinse it with deionized water, dry it with cold air, and put it into a tube furnace;

[0050] Step 4: As in Example 1, argon gas is first passed through the tube furnace, the temperature is gradually raised to 675° C., and the he...

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Abstract

The invention provides a surface alloying control method for improving corrosion resistance of nickel-aluminum bronze. The method comprises the following steps: a nickel coating layer is electroplated on the surface of the nickel-aluminum bronze; and the heat treatment is performed at a temperature of 200-675 DEG C to obtain the surface-alloyed nickel-aluminum bronze. Compared with the prior art, the method has the following beneficial effects: (1) double modified layers are formed on the surface of the nickel-aluminum bronze: the outer layer is a higher-corrosion-resistance Ni-Cu solid solution layer; and the inner layer is a high-strength and high-binding-force Ni-Al-Cu uniform layer; and (2) the electroplating and heat treatment process is simple, low in cost, economical and effective.

Description

technical field [0001] The invention relates to surface treatment technology, in particular to a surface alloying method for improving the corrosion resistance of nickel-aluminum bronze alloy. The invention relates to forming a double alloyed layer with high corrosion resistance of the outer layer and high strength of the inner layer on the surface of nickel-aluminum-bronze alloy by means of heat treatment diffusion, and belongs to the technical field of material surface modification. Background technique [0002] Nickel-aluminum bronze alloys are widely used in marine engineering, coastal power plants and seawater desalination plants for their high thermal conductivity, high corrosion resistance and high mechanical properties, such as marine propeller drilling platforms, valves, etc., especially in condenser pipes and heat exchange Among the pipe materials, the most commonly used are 70Cu-30Ni and 90Cu-10Ni alloys. [0003] However, nickel-aluminum bronze itself has defect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/12C25D5/18C25D5/34C25D5/50
CPCC25D3/12C25D5/18C25D5/34C25D5/50
Inventor 吴忠刘磊罗芹秦真波沈彬张琪刘德荣胡文彬
Owner SHANGHAI JIAO TONG UNIV