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Ni-Sn-P pinhole-free ternary coating plating solution for marine facilities and application thereof

A ni-sn-p, pinhole-free technology, applied in coating, liquid chemical plating, metal material coating process, etc., can solve problems such as poor stability of plating solution, unsuitability for large-scale marine facilities, harsh operating conditions, etc. , to achieve strong neutral salt spray resistance, improve substrate coverage, and enhance corrosion resistance

Active Publication Date: 2021-10-29
ZHOUSHAN INST OF CALIBRATION & TESTING FOR QUALITY & TECHNICAL SUPERVISION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the plating solution mainly composed of hypophosphite, the waste solution after plating contains a large amount of phosphoric acid and other difficult-to-handle substances. The treatment of waste solution is still a difficult problem for the development of electroless plating, and there are Poor stability, harsh operating conditions, low Sn and P content in the coating, slow plating speed, etc.
[0005] Nickel chloride is used as the nickel salt. When electroless plating some workpieces that are easily corroded, such as aluminum, aluminum alloys and iron alloys, because the activity of chloride ions is too high, it will corrode the workpiece. It is suitable for plating objects. Alloy steel or carbon alloy steel used in marine facilities, so nickel chloride cannot be used as nickel salt; in addition, tin methanesulfonate microcapsules (Sn(CH 3 SO 3 ) 2 @SiO 2 ) is chemical plating treatment for tin salt, the cost is high, and it is not suitable for surface treatment of large-scale marine facilities

Method used

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  • Ni-Sn-P pinhole-free ternary coating plating solution for marine facilities and application thereof
  • Ni-Sn-P pinhole-free ternary coating plating solution for marine facilities and application thereof
  • Ni-Sn-P pinhole-free ternary coating plating solution for marine facilities and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1 Orthogonal method to prepare Ni-Sn-P ternary coating

[0047] 1.1 Plating solution formula and design of orthogonal experiment

[0048] The formulation of the Ni-Sn-P ternary plating solution in this experiment uses tin tetrachloride (1g / L) as the tin salt, the nickel salt as nickel sulfate (6-14g / L), and sodium hypophosphite (16-14g / L). 24g / L), buffering agent sodium acetate (6-8g / L), complexing agent sodium citrate (5-10g / L), stabilizer sodium thiosulfate, the optimal concentration is not more than 2mg / L (0.5-2.0mg / L), surfactant adopts sodium lauryl sulfate (0.3g / L). Orthogonal experiment design is shown in Table 1. In addition to the main components shown in the table, other parameters should be guaranteed: temperature 90°C, pH: 4.5-5.5.

[0049] Table 1 Orthogonal test formula design

[0050]

[0051]

[0052] 1.2 Plating operation process

[0053] 1) Pretreatment of plating samples:

[0054] (1) Sample grinding: select some steel plates with a size of ...

Embodiment 2

[0087] A kind of Ni-Sn-P non-pinhole ternary coating bath for marine facilities, its formula is:

[0088] Nickel sulfate 8g / L, tin tetrachloride 1g / L, sodium hypophosphite 22g / L, sodium citrate 10g / L, sodium acetate 6g / L, sodium thiosulfate 1mg / L, sodium lauryl sulfate 0.3 g / L; the solvent is distilled water.

[0089] The specific configuration steps of the plating solution are as follows: according to the above-mentioned plating solution formula, accurately weigh the quality of each solid medicine with an electronic balance with an accuracy of 0.0001 g, and put them into a beaker and dissolve them with distilled water in turn. Add the dissolved solution into a plating container, add distilled water to an accurate volume and then stir at a constant speed to obtain a Ni-Sn-P plating solution. Ultrasonic shake the Ni-Sn-P plating solution evenly before use.

[0090] Apply the prepared plating solution to the surface of the carbon steel base material to implement electroless Ni...

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Abstract

The invention relates to a preparation method of a plating solution, in particular to a Ni-Sn-P pinhole-free ternary coating plating solution for marine facilities and application thereof, and belongs to the technical field of surface treatment. The Ni-Sn-P pinhole-free ternary coating plating solution for the marine facilities comprises 7 to 9 g / L of nickel salt, 1 g / L of tin tetrachloride serving as tin salt, 18 to 22 g / L of a reducing agent, 5 to 10 g / L of a complexing agent, 0.5 to 2.0 mg / L of a stabilizer, 0.3 g / L of lauryl sodium sulfate serving as a surfactant, and water serving as a solvent, wherein the pH value is adjusted to 4.5 to 5.5 by using a 6 to 8g / L of a buffer agent. The Ni-Sn-P pinhole-free ternary coating plating solution is simple in formula and preparation process, low in cost, environmentally friendly and efficient in plating rate, the surface of a coating is flat and smooth, excellent neutral salt mist resistance is shown, the requirement for corrosion resistance is met, and the Ni-Sn-P pinhole-free ternary coating plating solution has wide application prospects in the field of marine corrosion resistance.

Description

technical field [0001] The invention relates to a preparation method of a plating solution, in particular to a Ni-Sn-P pinhole-free ternary plating solution for marine facilities and an application thereof, belonging to the technical field of surface treatment. Background technique [0002] As a new type of material, electroless Ni-P is developing very fast. Because of its uniform thickness, high hardness, high wear resistance and excellent corrosion resistance, it has been widely used in industrial fields. However, the nickel plating layer is easily oxidized and darkened in humid atmosphere or sulfur-containing environment, which not only affects the appearance, but also reduces the corrosion resistance and welding performance of the film layer. It is difficult for Ni-P single metal plating layer to adapt to specific fields. service environment. Existing studies have shown that adding a small amount of Sn to the Ni-P coating will improve the ability of the alloy coating to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/50
CPCC23C18/50C23C18/1637
Inventor 卢芳芳王海荣叶贤槐厉梁季建孙宝库毛坤宇陈拓
Owner ZHOUSHAN INST OF CALIBRATION & TESTING FOR QUALITY & TECHNICAL SUPERVISION