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

A technology of surface chemistry and nickel sulfate, applied in the field of low-cost technology, can solve the problem of high cost of Ni-P plating process, and achieve the effect of low cost and simple plating solution formula

Inactive Publication Date: 2010-03-24
ZHONGYUAN ENGINEERING COLLEGE
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  • Abstract
  • Description
  • Claims
  • Application Information

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

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Embodiment Construction

[0019] l. Treatment before plating.

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

[0021] The formula of alkaline lotion is shown in Table 1:

[0022] Table 1

[0023]

[0024] The acid lotion formula is shown in Table 2

[0025] Table 2

[0026]

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

[0028] table 3

[0029]

[0030] 2. Plating solution formula and plating conditions

[0031] The bath formula and plating conditions are shown in Table 4

[0032] Table 4

[0033]

[0034] The plating solution is prepared by one-step acid plating solution. The principle is to directly prepare electroless nickel plating solution according to the formula. The specific operation steps are as follows:

[0035] (1) Measure the nickel sulfate, reducing agent (sodium hypophosphite), complexing agent (sodium citrate), and buffer (ammonium hydrogen fluoride) accor...

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

Claims

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Application Information

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