Tin-Nickel Chrome Plating Film Corrosion Resistance
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Solution Overview
Problem
Conventional multilayer plating films, even with two or three layers of nickel plating and chrome finish plating, are insufficient in corrosion resistance for applications like faucet fittings.
Innovation Solution
A multilayer plating film comprising a tin-nickel plating film beneath a chrome plating film, using an acidic tin-nickel alloy plating solution with divalent tin, nickel, triamine, and fluoride, providing enhanced corrosion resistance and a bright appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional nickel plating and chrome plating are used in multilayer configuration, then the plating film has basic corrosion resistance, but the corrosion resistance is insufficient for faucet fitting applications
Solution Approach 1:
The invention changes the chemical composition parameters of the plating solution by introducing a specific acidic tin-nickel alloy plating solution containing a divalent tin compound, nickel compound, triamine compound, and fluoride. This parameter change in the plating solution composition enables the formation of a tin-nickel plating film with significantly enhanced corrosion resistance compared to conventional nickel plating, while maintaining a relatively simple two-layer or three-layer plating structure.
2Reliability
If conventional nickel plating is used on faucet fittings, then the plating provides basic corrosion protection, but nickel elution occurs from the nickel plating film
Solution Approach 1:
The invention creates a composite plating film structure by forming a tin-nickel plating film through co-deposition of tin and nickel metals in specific proportions (Sn: 6-14 mass%, Ni: 86-94 mass%). This composite material structure prevents nickel elution because the tin component forms a protective barrier that reduces nickel ion release into the environment, while the specific composition ratio optimizes both corrosion resistance and environmental safety.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The multilayer plating film achieves superior corrosion resistance and aesthetic appeal, preventing nickel elution from faucet fittings, which was a problem with conventional nickel and chrome plating combinations.
Implementation Method 1
the tin-nickel plating film is formed below the chrome plating film by using an acidic tin-nickel alloy plating solution containing a divalent tin compound, a nickel compound, a triamine compound, and a fluoride
Data Source
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AI summary
An object of the present invention is to provide a multilayer plating film with excellent corrosion resistance. The present invention provides a multilayer plating film containing at least a chrome plating film and a tin-nickel plating film, the chrome plating film being the outermost layer, and the tin-nickel plating film being formed below the chrome plating film by using an acidic tin-nickel alloy plating solution containing a divalent tin compound, a nickel compound, a triamine compound, and a fluoride.