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Surface chemical plating Ni-P process using nickel sulfate as main salt

A surface chemistry, nickel sulfate technology, applied in liquid chemical plating, metal material coating process, coating and other directions, can solve the problem of high cost of Ni-P plating process, achieve the effect of low cost and simple plating solution formula

Inactive Publication Date: 2008-05-28
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problem of the high cost of the existing magnesium alloy Ni-P plating process, the present invention provides a low-cost electroless Ni plating on the surface of Mg-Al-Zn series (AZ series) magnesium alloys with nickel sulfate as the main salt. -P process, which can obtain a Ni-P coating on the surface of magnesium alloy that is equivalent to the plating process of basic nickel carbonate as the main salt

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] 1. Pre-plating treatment.

[0020] The pre-plating treatment of the workpiece includes four steps of surface ultrasonic cleaning, alkali cleaning, pickling and activation, with water washing in between.

[0021] Alkaline lotion formula is shown in Table 1:

[0022] Table 1

[0023] Element

composition

condition

NaOH

5g / L±1g / L

Temperature 60℃±5℃

Na 3 POZ 4 12H 2 o

10g / L±2g / L

The time is 8-10 minutes.

[0024] See Table 2 for pickling solution formula

[0025] Table 2

[0026] Element

composition

condition

CrO 3

125g / L±5g / L

temperature room temperature

HNO 3 (70%)

110ml / L±5ml / L

Time 20~60s

[0027] The formula of activation solution is shown in Table 3

[0028] table 3

[0029] Element

composition

condition

HF (40%)

380ml / L±5ml / L

Stir at room temperature for 20-60s

[0030] 2. Plating solution formula and...

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Abstract

The invention relates to a chemical Ni-P plating technique on the surface of magnesium alloy which takes nickel sulfate (NiSO4, 6H20) as the main salt. The technique process is as follows, ultrasonic cleaning, alkali cleaning, acid cleaning, activation, and chemical nickel phosphorus plating (water cleaning is employed among steps), dispensations of plating solution are NiSO4, 6H2O (20 grams per liter), HF (40%, 12 milliliter per liter), Na3C6H5O7, 2H2O (20 grams per liter), NH4HF2 (10 grams per liter), NH3, H20 (25%, 30 milliliters per liter), and NaH2PO2, H2O (20 grams per liter), and the plating temperature is 88 +-2 DEG C. The plating speed on the surface of magnesium alloy is 20 micrometers per hour, and the plated rigidity is 300-500 HV. The invention is low in cost and simple in plating solution dispensation, and is applicable to the magnesium alloy in Mg-Al-Zn series (AZ series).

Description

technical field [0001] The present invention relates to a kind of nickel sulfate (NiSO 4 ·6H 2 O) The surface chemical plating Ni-P process of main salt is a low-cost process for implementing protective chemical plating on the surface of magnesium alloys. Background technique [0002] Electroless Ni-P plating on the surface of magnesium alloy is an effective method to improve the corrosion resistance and surface mechanical properties of magnesium alloy. For electroless Ni-P plating on the surface of iron-based alloys and other materials, nickel sulfate is usually used as the main salt. Due to the high chemical activity of magnesium, a mature process for electroless Ni-P plating on the surface of magnesium alloys is to use basic nickel carbonate (NiCO 3 2Ni(OH) 2 4H 2 O) is the main salt. For the plating process using nickel sulfate as the main salt, the limited technical literature is based on complex solution formulations, the cost is still high, and the application o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/32C23C18/36
Inventor 郭建
Owner ZHONGYUAN ENGINEERING COLLEGE
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