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Chemical nickel-phosphorus plating method on surface of zirconium-aluminum alloy

A zirconium-aluminum alloy, surface chemical technology, applied in the field of alloy surface coating strengthening treatment, to achieve the effects of excellent corrosion resistance and wear resistance, firm bonding and wide applicability

Inactive Publication Date: 2013-01-09
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on the surface treatment of zirconium alloys to improve their corrosion resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) zirconium and aluminum with a mass fraction of aluminum of 8.8% are prepared in proportion and then smelted repeatedly to achieve uniform composition and obtain zirconium-aluminum alloy;

[0032] (2) cutting the prepared zirconium-aluminum alloy wire into a size of 15×5×3mm;

[0033] (3) prepare nickel-phosphorus electroless plating solution, the chemical composition of this plating solution is as follows:

[0034] Main salt nickel sulfate 20g / L, reducing agent sodium hypophosphite 40g / L, ammonium sulfate 40g / L, sodium acetate 40g / L, lead acetate 1mg / L;

[0035] (4) Mechanically polish the zirconium-aluminum alloy, and polish it sequentially with 400, 600, 800, and 1000-mesh sandpaper to make the surface smooth and bright, and then perform ultrasonic cleaning. The ultrasonic cleaning is to immerse the zirconium alloy in deionized water and acetone successively. Clean in an ultrasonic cleaner for 5 minutes, remove grease, rinse with deionized water and dry;

[0036...

Embodiment 2

[0042] (1) zirconium and aluminum with a mass fraction of aluminum of 8.0% are prepared in proportion and smelted repeatedly to achieve uniform composition;

[0043] (2) The plating solution formula and steps (2) (3) (4) (5) and (8) of the present embodiment are exactly the same as the above-mentioned implementation 1, except that steps (6) and (7) are different.

[0044] The pickling liquid used in the step (6) of this embodiment is the same as that of Example 1, except that the time is 10s.

[0045] The step (7) of the present embodiment is zinc dipping, and the zinc dipping liquid consists of: zinc sulfate 30g / L, sodium pyrophosphate 120g / L, an aqueous solution of sodium carbonate 5g / L, pH is 10, it is heated to 80 ℃, Put in the zirconium-aluminum alloy, and galvanize for 10 minutes.

[0046] Finally, in this embodiment, a nickel-phosphorus alloy coating with metallic luster can be obtained on the surface of the zirconium-aluminum alloy, and the thickness of the coating is...

Embodiment 3

[0048] The process and steps of this embodiment are exactly the same as those of the above-mentioned embodiment 1, except for the formula of the electroless plating solution.

[0049] The chemical composition of the plating solution of the present embodiment is:

[0050] Main salt nickel sulfate 28g / L

[0051] Reducing agent sodium hypophosphite 30g / L

[0052] Lactic acid 20g / L

[0053] Sodium acetate 35g / L

[0054] Then, its process and steps are exactly the same as (2)(3)(4)(5)(6) and (7) in embodiment 1. The pH of the electroless nickel plating is adjusted at about 4.5, the temperature is controlled at 75°C, and the plating time is 60 minutes. Finally, in this embodiment, a nickel-phosphorus alloy coating with metallic luster can be obtained on the surface of the zirconium alloy, and the thickness of the coating is 15-20 μm.

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Abstract

The invention discloses a chemical nickel-phosphorus plating method on the surface of a zirconium-aluminum alloy. The method comprises the following steps of: (1) after preparing zirconium and aluminum according to a certain proportion, repeatedly melting to uniformize the components; (2) linearly cutting the prepared zirconium-aluminum alloy according to a certain size, polishing by using abrasive papers with the different finenesses, and carrying out alkali washing after ultrasonically cleaning by using deionized water and acetone; (3) placing a test sample in a mixed solution of HF, HNO3 and H2O for 10-30 s; (4) phosphating or performing zinc dipping; and (5) performing chemical plating, wherein the chemical plating can be neutral or acidic chemical plating. According to the method disclosed by the invention, a uniform and compact nickel-phosphorus coating with a thickness of 10-20 mum can be prepared on the surface of the zirconium-aluminum alloy, so that the abrasion corrosion resistance of the zirconium alloy is obviously improved. The method has a wide application range; and bright and compact nickel-phosphorus coatings with excellent abrasion corrosion resistance and firm combination with a substrate, can be formed on the zirconium-aluminum alloys with different components. The method disclosed by the invention is particularly suitable for strengthening parts with complex shapes.

Description

technical field [0001] The invention relates to a method for chemically plating nickel and phosphorus on the surface of a zirconium-aluminum alloy, and belongs to the technical field of alloy surface coating strengthening treatment. Background technique [0002] In 1824, Berzelius isolated a laboratory quantity of zirconium for the first time, and since then zirconium has entered people's field of vision and has attracted widespread attention. At present, zirconium has been used in many fields, such as in the electronics industry, as an absorbent for residual gases and in the manufacture of vacuum tube parts. Its good corrosion resistance makes it suitable for making surgical tools, chemical equipment, electrical parts, jewelry. Zirconium powder can be used in flash powder, flash signal, fireworks and detonators, etc. Zirconium has a low thermal neutron absorption cross section, good corrosion resistance, and high thermal conductivity. Zirconium alloys have been widely use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/36C23C18/18
Inventor 马静李强国栋李建辉毛磊
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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