Alloy Surface Coatings for Moveable Components in Functional Fluids
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Solution Overview
Problem
Existing surface coatings for moveable components in devices fail to provide adequate wear resistance and corrosion protection, especially in environments with functional fluids, leading to reduced component lifetime.
Innovation Solution
A surface coating comprising an alloy layer with molybdenum or tungsten, combined with elements like nickel, cobalt, chromium, tin, phosphorous, iron, magnesium, or boron, which can be electrodeposited and may include additional layers for enhanced properties, providing improved wear resistance and corrosion protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional surface coatings are applied to moveable components, then the components can function in various environments, but the coatings fail to provide adequate wear resistance and corrosion protection, leading to reduced component lifetime
Solution Approach 1:
The patent applies composite materials by creating a multi-layer coating system consisting of a zinc base layer combined with overlay layers containing specific alloying elements (aluminum, nickel, cobalt, manganese, silicon, boron, or carbon). This composite structure provides synergistic protection where the zinc layer offers corrosion resistance while the overlay layers enhance wear resistance and oxidation resistance, thereby extending component lifetime in harsh environments
Solution Approach 2:
The patent employs parameter changes by precisely controlling the composition ranges of alloying elements in the coating layers. Specific weight percentage ranges are specified for each element (e.g., aluminum: 1-20%, nickel: 1-30%, cobalt: 1-25%) to optimize the balance between wear resistance, corrosion protection, and ductility. This compositional parameter optimization resolves the contradiction by tailoring the coating properties to achieve both protective functions simultaneously
2Duration of action of moving object
If surface coatings are applied to provide wear resistance, then component lifetime is extended, but the coatings may cause hydrogen embrittlement, reducing ductility
Solution Approach 1:
The patent resolves the hydrogen embrittlement issue through parameter changes by strictly controlling the sulfur content (≤0.01%) and phosphorus content (≤0.03%) in the zinc layer, and by specifying minimum ductility requirements (≥5% elongation). These compositional parameters are optimized to prevent hydrogen accumulation and embrittlement while maintaining the coating's protective functions and extending component lifetime
Solution Approach 2:
The patent applies local quality by creating distinct functional zones within the coating structure. The zinc base layer provides corrosion protection with controlled impurity levels to prevent hydrogen embrittlement, while the overlay layers with specific alloying elements provide wear and oxidation resistance. This spatial differentiation of properties allows the coating system to extend component lifetime without compromising the substrate's ductility
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 alloy layer coating significantly extends the lifetime of moveable components by enhancing wear resistance and corrosion protection, maintaining performance even in harsh environments and high temperatures, while avoiding hydrogen embrittlement and maintaining ductility.
Implementation Method 1
A surface coating comprising an alloy layer with molybdenum or tungsten, combined with elements like nickel, cobalt, chromium, tin, phosphorous, iron, magnesium, or boron, which can be electrodeposited
Data Source
AI summary
Devices with a moveable component that includes a coated surface are described. In some examples, the moveable component can contact a functional fluid during movement of the moveable component. The moveable component includes a coated surface with a surface coating comprising an alloy layer. The alloy layer comprises molybdenum or tungsten in combination with one or more other materials.