Non-ammonia type plating solution for chemical nickel plating

Abstract

The invention discloses an ammonia-free chemical nickel plating bath which adopts an ammonia-free pH modifying agent to regulate the pH value of the bath. Each liter of the bath contains the components that nickel salt is 24 to 30g, reducing agent is 24 to 33g, buffering agent is 10 to 18g, complexing agent is 20 to 30g, stabilizing agent is 0.5 to 1.5mL, brightener is 1.5 to 3.0mL, and others are water. In the ammonia-free chemical nickel plating bath, the ammonia-free pH modifying agent is selected from one or the mixture of sodium hydroxide, and potassium hydroxide or potassium carbonate. All materials in the ammonia-free chemical nickel plating bath do not contain heavy metal, ammonia water is not utilized to regulate the pH value, the problems of environment pollution, invalidation caused by overlong storing time of the bath, etc. are not caused, and the obtained chemical plating bath is friendly to the environment, in addition, the luminance brightness of the made plating layer can be full-bright. The bath has wide application prospect.

Description

technical field [0001] The invention relates to an electroless plating solution, in particular to an ammonia-free electroless nickel plating solution. Background technique [0002] Common electroless plating solutions use ammonia water to provide alkalinity to adjust the pH value of the plating solution and provide complexation to complex nickel ions in the plating solution. The complexing ability of ammonia water can make the plating solution more stable, and the alkalinity and weak complexing ability provided by ammonia water can maintain the plating speed of the plating solution at a relatively high level. However, the ammonia water used in the coating preparation process is very volatile, causing environmental pollution, and does not meet the requirements of clean production; at the same time, the content of ammonia water in the plating solution decreases a lot with the increase of time, which has a certain impact on the performance of the plating solution. Ammonia must...

AI Technical Summary

Problems solved by technology

However, the ammonia water used in the coating preparation process is very volatile, causing environmental pollution, and does not meet the requirements of clean production; at the same time, the content of ammonia water in the plating solution decreases a lot with the increase of time, which has a certain impact on the performance of the plating solution. Ammonia must be added continuously

After four MTO (cycle periods) of the electroless plating solution using ammonia water, the plating speed attenuation is relatively serious, usually below 10 μm / h, which greatly reduces the production efficiency and increases the production cost of the factory.