A kind of additive for zinc-copper composite mechanical plating

Abstract

The invention discloses an addition agent for zinc-copper composite mechanical plating, and belongs to the technical field of hardware surface treatment. The addition agent comprises, by mass percent, 3% to 6% of copper sulfate, 1% to 2% of sodium citrate, 1% to 2% of sodium bentonite, 0.3% to 0.5% of salicylic acid, 6% to 10% of stannous chloride, 10% to 15% of citric acid, 10% to 13% of polyethylene glycol 1000 and the balance water. The addition agent is in a water solution state, and is convenient to use, during adding use, the agent can be directly weighed and used, further expansion is not needed, during use, the adding amount is related with the surface area of a product to be subject to steel plating, components of the addition agent are common raw materials, the raw material source and purchasing are convenient, by the adoption of the addition agent, a zinc-copper composite mechanical coating can be prepared on the surface of the steel product, and dual effects of surface protection and decoration can be obtained.

Description

technical field [0001] The invention relates to an additive for zinc-copper composite mechanical plating, which belongs to the technical field of hardware surface plating and is used for zinc-copper composite plating treatment on the surface of iron and steel parts. Background technique [0002] Mechanical plating technology has many advantages such as high efficiency, low cost, low energy consumption, simple process, and low environmental pollution. With the continuous improvement of consumers' requirements for the quality of surface plating layer, traditional mechanical galvanizing layer is difficult to meet the requirements of the hardware industry. Demand, which provides a good opportunity for the development of mechanical plating composite coating process. The metal zinc coating on the steel substrate can provide excellent corrosion resistance, and the copper and copper alloy coating can provide a beautiful decorative effect. The surface of the hardware substrate is pl...

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Problems solved by technology

[0004] Invention patent (application number 2015105706970) proposes a deposition accelerator for mechanical copper plating and copper alloy coating and its application, invention patent (application number 2015105710181) proposes a mechanical copper plating and copper alloy process, invention patent (application number 2015105710410 ) proposed a mechanical copper plating and copper alloy accelerator and its application method. They are directly copper-plated on the surface of the steel substrate, or on the surface of the substrate zinc-tin transition layer (or called the bottom layer, the thickness is relatively thin, about 1 ~3 microns) copper plating, but not on a mechanically galvanized surface of a certain thickness

Their common feature is that the accelerator contains triethanolamine and ammonium salt. There is no reaction between triethanolamine and the substrate steel, and it has a corrosive effect on the surface of copper, aluminum, zinc and their alloys, which can ensure the copper plating layer on the surface of the steel substrate. The bonding strength can also ensure the bonding strength between the copper powder particles in the coating; but when copper is plated on the surface of the zinc layer with a certain thickness, because triethanolamine acts on the zinc and copper surfaces at the same time, it is difficult to form a firm bond on the surface of the zinc layer. The copper layer, in addition, triethanolamine has certain toxicity and is not environmentally friendly

[0005] Engineers in the field of mechanical galvanizing technology adopt the conventional mechanical galvanizing process. Firstly, a zinc layer of the required thickness is prepared on the surface of the substrate, and then the zinc powder is replaced with copper powder or copper alloy powder. The method of adding copper sulfate or other copper salts in the middle is used to plate copper on the surface of the zinc layer, but a large number of attempts have ended in failure.