Faucet Fitting Antifouling Plating Corrosion Prevention
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Solution Overview
Problem
Faucet fittings with exposed corrosive metals on the inner side are prone to local corrosion when an organic compound layer is formed, leading to structural weakness and water leakage, despite providing antifouling properties on the outer surface.
Innovation Solution
A faucet fitting design where an organic compound layer is applied only on the passivation layer, forming a self-assembled monolayer with a phosphonic acid group, ensuring the phosphorus atom concentration is higher on the plated surface than on unplated areas, preventing local corrosion while maintaining antifouling functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a layer of organic compound is formed on the metal base material without a passivation layer, then antifouling property is imparted, but local corrosion occurs leading to structural weakness and water leakage
Solution Approach 1:
The surface is segmented into two distinct regions: a plated surface with passivation layer and organic compound layer for antifouling, and an unplated surface without organic compound layer to prevent corrosion. This spatial segmentation allows simultaneous achievement of antifouling properties and corrosion resistance by applying different treatments to different areas.
Solution Approach 2:
Different surface qualities are applied to different locations: the plated surface receives the organic compound layer for water-repellency and antifouling, while the unplated surface remains untreated with organic compound to maintain corrosion resistance. This local differentiation resolves the contradiction between antifouling and corrosion resistance.
2Object-affected harmful factors
If a layer of organic compound is formed on the passivation layer, then antifouling and scale removal performance is improved, but the complexity of the coating structure increases
Solution Approach 1:
The passivation layer serves as an intermediary between the metal base material and the organic compound layer. It provides a stable interface that enables the organic compound layer to form effectively while protecting the underlying metal, thus improving scale removal performance without excessive structural complexity.
Solution Approach 2:
The passivation layer is formed in advance on the plated surface before applying the organic compound layer. This preliminary action creates a stable foundation that simplifies the subsequent coating process and ensures reliable antifouling performance.
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 solution effectively prevents local corrosion and enhances antifouling and scale removal performance without compromising the structural integrity of the faucet fitting, ensuring reliable operation and easy cleaning.
Implementation Method 1
the layer of organic compound binds to the passivation layer by binding the metal element (M) constituting the passivation layer via an oxygen atom (O) to a phosphorus atom (P) of at least one group (X) selected from a phosphonic acid group, a phosphoric acid group, and a phosphinic acid group (M-O—P bond)
Implementation Method 2
a water-repellent antifouling layer is known... the fixation of silicic acid scale stains is suppressed by providing an antifouling layer that shields hydroxyl groups on the surface
Data Source
AI summary
Provided is a faucet fixture to which antifouling functionality is imparted without causing localized corrosion. The present invention is a faucet fixture comprising a metal base material and a plating layer partially formed on the surface of the metal base material. The metal base material contains at least one metal element species selected from the group consisting of copper, zinc, and tin. The plating layer contains at least one metal element species selected from the group consisting of chromium and nickel. An organic layer is further provided on the plating layer, with a passive layer present on the surface of the plating layer being interposed therebetween. The organic layer is bonded to the passive layer via the bonding of a metal element (M), which constitutes the passive layer, and a phosphorus atom (P) in at least one type of group (X) selected from the group consisting of phosphonate groups, phosphate groups, and phosphinate groups, with an oxygen atom (O) interposed therebetween (M-O—P bond). Group X is bonded to a group R (wherein R is a hydrocarbon group, or a group comprising an atom other than carbon at one or two locations within a hydrocarbon group). The phosphorus atom concentration in the portion of the surface of the metal base material on which the plating layer is not formed is lower than the phosphorus atom concentration in the organic layer provided on the plating layer.