Steel piece alkaline deep hole nickel plating additive, pre-plating solution and pre-plating technology

Abstract

The invention relates to a steel piece alkaline deep hole nickel plating additive, a pre-plating solution and a pre-plating technology. The steel piece alkaline deep hole nickel plating additive comprises an open cylinder agent and a deep hole agent. The open cylinder agent comprises following substances including an alkalescence complexing agent, an alcohol compound, an additive A, an anionic surfactant, chloride, fluoride, an aldehyde compound, an alkaline compound, a phosphate compound, boric acid and / or a borate compound. The deep hole agent comprises following substances including a phosphate compound, an alkaline compound, chloride, an aldehyde compound and an additive B. The pre-plating solution comprises nickel sulfate heptahydrate and the above nickel plating additive and comprises 15-35 g / L of the nickel sulfate heptahydrate, 200-250 g / L of the open cylinder agent and 15-30 g / L of the deep hole agent, and the pH value of the steel piece alkaline deep hole nickel plating pre-plating solution is 8.5-10.0. By means of the steel piece alkaline deep hole nickel plating additive, the pre-plating solution and the pre-plating technology, pre-plating of the surface of a workpiece,the pipe wall of the workpiece and the inner wall at the deep hole position can be finished at a time; and meanwhile the problem about dissolving of a nickel anode is solved. According to the ammonia-free alkaline deep hole nickel plating technology, secondary pollution is reduced.

Description

technical field [0001] The invention relates to the electroplating technical field of electrodeposition, in particular to an alkaline deep-hole nickel plating additive for iron and steel parts, a preplating solution and a preplating process. Background technique [0002] Today's protective and decorative electroplating of steel parts, when steel parts are directly electroplated in acidic copper sulfate solution, because the standard potential difference between copper and iron is far away, when the steel parts are immersed in the solution and before the current is connected, they will be quickly replaced on the substrate A loose copper layer with very poor adhesion is deposited. Therefore, in order to obtain an electroplated layer with good bonding force, pre-plating must be carried out before acid copper plating of steel parts. In addition to multi-layer nickel and chrome plating for parts with high quality requirements, most parts are first coated with a layer of 0.2-0.5 ...

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Problems solved by technology

[0009] Based on this, the object of the present invention is to provide a kind of alkaline deep-hole nickel plating additive for iron and steel parts, pre-plating solution and pre-plating process, under the premise of meeting the requirements of electroplating users for production cost and environmental protection, to solve the problem of electroplating of steel substrates. The problem of the bonding force between the pre-plating layer and the substrate before bright acid copper; the pre-plating can be completed on the surface of the workpiece and the inner wall of the deep hole at one time, and the inner wall of the pipe and deep hole that the current cannot reach is also chemical Plated with a dense nickel coating, the invention adopts an alkaline deep-hole nickel plating process without ammonia, which reduces secondary pollution, improves the production environment, and solves the problem of nickel anode dissolution at the same time, so that the concentration of nickel ions in the plating solution is maintained It is stable and overcomes the problems of turbid plating solution due to poor anode dissolution, difficulty in filtering and a large amount of foam when stirred by air

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