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Magnesium alloy chemical nickel plating pretreatment activating solution

A magnesium alloy and solution technology, applied in the coating process of metal materials, etc., can solve the problems of complicated process and environmental pollution, and achieve the effect of convenient operation, simple composition and convenient preparation

Inactive Publication Date: 2007-09-26
MITAC PRECISION TECH CO LTD SHUNDE DISTRICT FOSHAN CITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a chromium-free passivation solution and process method for the pretreatment of electroless nickel plating on the surface of magnesium alloys, so as to overcome the complicated and complicated process of electroless nickel plating on magnesium alloys, causing environmental pollution and other problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Weigh the reagents according to the following formula: 1 gram of potassium permanganate, 20 grams of ammonium dihydrogen phosphate, and 20 grams of ammonium hydrogen fluoride; first dissolve the above-mentioned reagents with a small amount of water, and then mix and dilute to 1 liter to obtain the free Chromium passivation solution, adjust the pH value to 3.5 with ammonia water and phosphoric acid; then weigh the reagents according to the following formula: 30 grams of nickel sulfate, 25 grams of sodium citrate, 30 grams of sodium hypophosphite, and 10 grams of potassium fluoride. The reagents were dissolved in a small amount of water, and then mixed and diluted to one liter. The solution was an alkaline electroless nickel plating solution, and the pH value was adjusted to 8.5-9.0 with concentrated ammonia water; then weigh 30 grams of nickel sulfate according to the following formula, lemon 15 grams of sodium acetate, 20 grams of sodium acetate, 30 grams of sodium hypop...

Embodiment 2

[0018] Take by weighing 2 grams of reagent potassium permanganate, 10 grams of ammonium dihydrogen phosphate, and 15 grams of ammonium hydrogen fluoride according to the following formula; first dissolve the above-mentioned reagents with a small amount of water, and then mix and dilute to 1 liter to obtain the non-toxic compound of the present invention. Chromium passivation solution, adjust the pH value to 3.5 with ammonia water and phosphoric acid; then weigh the reagents according to the following formula: 30 grams of nickel sulfate, 25 grams of sodium citrate, 30 grams of sodium hypophosphite, and 10 grams of potassium fluoride. Dissolve the reagents in a small amount of water, and then mix and dilute to one liter. This solution is the alkaline electroless nickel plating solution. Adjust the pH value to 8.5-9.0 with concentrated ammonia water; then weigh the reagents according to the following formula: 30 grams of nickel sulfate , 15 grams of sodium citrate, 20 grams of sod...

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Abstract

The invention discloses a non-chromium inactivating solution to deposit nickel on the magnesium alloy surface, which comprises the following parts per liter: 0.1 -10g potassium permanganate, 5-30g ammonium dihydrogen phosphate and 1-30g ammonium hydrogen fluoride. The disposing method comprises the following steps: putting magnesium alloy with clean surface into sodium hydroxide solution with density at 0.5-5% for 1-10 min; cleaning through ultraviolet; immersing in the oxalic acid with density at 0.5-5% for 0.5-5min; cleaning through ultrasound again; immersing the disposed magnesium alloy into non-chromium inactivating solution with pH value at 2-7 adjusted by ammonia and phosphoric acid for 10-120s; washing through ultrasound; depositing nickel on the disposed magnesium alloy; washing through water; drying.

Description

technical field [0001] The invention belongs to the surface treatment technology of magnesium alloys, and in particular relates to a chromium-free passivation solution used for the pretreatment of electroless nickel plating on the surface of magnesium alloys and a process method of using the solution for nickel plating on the surface of magnesium alloys. Background technique [0002] Electroless plating on the surface of magnesium alloy parts is different from steel parts, because magnesium alloys have high chemical activity and the surface is easily oxidized, so it is difficult to perform electroless plating on the surface, so the surface must be activated before electroless nickel plating. The conventionally adopted process is to passivate with hexavalent chromium first, or make a primer with copper cyanide, and then dip zinc. Mixture of chromium oxide and nitric acid→water washing→hydrofluoric acid immersion→water washing→electroless nickel plating→water washing→drying; a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/18C23C18/32C23C22/07C23G1/00
Inventor 王江锋陈其亮
Owner MITAC PRECISION TECH CO LTD SHUNDE DISTRICT FOSHAN CITY