Zn-Ni-Fe Alloy Plating Bath for Corrosion-Resistant Connectors

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Solution Overview

Problem

Current metal coatings, such as zinc plating, while improving corrosion resistance, do not adequately enhance the corrosion resistance of zinc itself, and existing zinc-nickel alloys lack the desired aesthetic appeal and corrosion protection for substrates like aluminum connectors.

Innovation Solution

A ternary zinc-nickel-iron alloy plating system using an aqueous alkaline electroplating bath with specific compositions of zinc, nickel, and iron ions, along with complexing agents and brighteners, is developed to create coatings that are aesthetically appealing, corrosion-resistant, and receptive to passivation films.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing zinc-nickel alloys are used, then corrosion resistance is improved, but aesthetic appeal and passivation film receptivity are insufficient

Engineering Contradiction:

Improvecorrosion resistanceVSAvoidaesthetic appeal

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The patent applies local quality by optimizing specific regions or aspects of the coating properties. The alloy composition and electroplating parameters are tuned to create a coating with enhanced surface characteristics (brightness, uniformity) in addition to corrosion resistance, addressing aesthetic requirements while maintaining protective function.

Inventive Principle:

Principle #3Local quality

2Reliability

If iron content is increased to adjust alloy composition, then corrosion protection is enhanced, but control complexity increases

Engineering Contradiction:

Improvecorrosion protectionVSAvoidalloy composition control

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent uses parameter changes to simplify control despite increased iron content. By establishing specific iron concentration ranges in the electroplating bath and corresponding current density parameters, the process achieves predictable alloy composition and enhanced corrosion protection through controlled electrochemical deposition.

Inventive Principle:

Principle #35Parameter changes

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 ternary zinc-nickel-iron alloy coatings exhibit improved corrosion resistance and passivation film receptivity, providing enhanced protection for substrates like aluminum connectors, with increased iron content predictably adjusting the alloy composition without impacting nickel percentages, thus simplifying control and achieving superior corrosion protection.

Implementation Method 1

The aqueous alkaline zinc-nickel-iron electroplating bath can be used to electroplate or electrodeposit ternary zinc-nickel-iron alloy coatings on electrically conductive substrates

Methodology Applied

Scientific EffectElectrodeposition: Electrodeposition