Copper-Tin-Zinc Alloy Plating for Biocidal Surfaces
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Solution Overview
Problem
Nosocomial infections and microbial transmission through contaminated surfaces in healthcare and food handling facilities remain a significant concern due to the survival and transmission of pathogenic bacteria on hardware and equipment, which existing technologies fail to adequately address.
Innovation Solution
A metal plating alloy comprising copper, tin, and zinc with anti-microbial properties, resistant to oxidation and suitable for use on hardware and equipment, inhibiting the growth and transmission of bacteria, including MRSA and E. coli, by forming a biocidal surface that can withstand cleaners and disinfectants, and optionally treated with surfactants or ethanol for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional metal surfaces are used in healthcare and food handling facilities, then the surfaces are easy to manufacture and maintain, but they allow bacteria and microbes to survive and transmit infections
Solution Approach 1:
The patent applies a composite plating material comprising copper (45-65% by weight), tin (25-45% by weight), and zinc (5-15% by weight) on metal substrates. This composite alloy combines the biocidal properties of copper with the corrosion resistance and aesthetic qualities of tin and zinc, creating a surface that is both effective against microbes and durable in various environments.
2Reliability
If copper plating is used to provide biocidal properties, then anti-microbial effectiveness is improved, but oxidation and tarnishing occur over time
Solution Approach 1:
The patent combines copper with tin and zinc in specific proportions to create an alloy where tin and zinc provide oxidation resistance and corrosion protection, while copper maintains its biocidal activity. The synergistic effect of this composite material resolves the contradiction between biocidal effectiveness and oxidation resistance.
3Reliability
If biocidal plating is applied to hardware surfaces, then bacterial transmission is reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The patent specifies precise compositional parameters for the plating alloy (copper: 45-65%, tin: 25-45%, zinc: 5-15% by weight) to optimize both biocidal effectiveness and manufacturability. These parameter ranges allow for consistent production through standard electroplating or hot-dip galvanizing processes, balancing performance requirements with manufacturing feasibility.
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 copper-tin-zinc alloy plating effectively reduces bacterial growth and transmission by up to 99.99% within hours, providing a durable, corrosion-resistant, and aesthetically pleasing surface that can be used on various medical and food handling equipment, reducing infection risks in high-risk environments.
Implementation Method 1
Both copper and tin have germicidal properties. Copper has even been shown to be effective against methicillin-resistant staphylococcus aureus ('MRSA')
Implementation Method 2
While copper will oxidize and tarnish over time, the copper containing alloy of the present application is resistant to oxidation
Data Source
AI summary
A plated object wherein the plating material has biocidal properties. The plated object can be used in a food preparation or medical care facility. The plating material includes approximately 55% copper (plus or minus 10%), 35% tin (plus or minus 10%) and 10% zinc (plus or minus 5%) by weight. In another embodiment, the plating material includes approximately 45% copper, 45% tin and 10% zinc. A method of depositing the plating material is also disclosed.