High-Quality Rhenium Coatings via Pulse Reverse Electrodeposition
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Solution Overview
Problem
There is a lack of viable methods for producing high-quality rhenium films and products coated with rhenium films, which are essential for leveraging rhenium's unique properties in engineering applications due to its high modulus of elasticity, tensile strength, creep-rupture strength, resistance to corrosive environments, and high melting point.
Innovation Solution
A method involving an electrodeposition system with a power supply, anode, and cathode, using a rhenium compound, a first salt, and an acid in an electrolyte solution, with a pulse or pulse reverse waveform to electrodeposit a rhenium layer on a substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional electrodeposition methods are used to deposit rhenium, then rhenium coating can be produced, but the coating quality is poor and the method is not viable for commercial production
Solution Approach 1:
The patent applies parameter changes by using pulse and pulse reverse waveforms instead of conventional DC electrodeposition. The pulse waveform parameters (on-time, off-time, current density) and pulse reverse waveform parameters (cathodic pulse followed by anodic pulse) are specifically optimized to achieve high-quality rhenium coatings with controlled grain structure and reduced defects, making the process commercially viable
Solution Approach 2:
The patent employs periodic action through pulse electrodeposition where the current is applied in periodic pulses rather than continuously. The cathodic pulse deposits rhenium while the off-time or anodic pulse allows for diffusion and stress relief, creating a periodic deposition cycle that produces high-quality coatings with fine grain structure and reduced internal stress
2Strength
If bulk rhenium is used for engineering applications, then all unique properties (modulus of elasticity, tensile strength, creep-rupture strength, corrosion resistance, melting point) are achieved, but the cost is high and processing is difficult
Solution Approach 1:
The patent applies the thin film principle by depositing rhenium as a coating layer on substrate materials rather than using bulk rhenium. The electrodeposited rhenium coating provides the desired mechanical properties (corrosion resistance, wear resistance, high-temperature stability) as a thin surface layer, avoiding the need to process expensive bulk rhenium while still achieving the unique properties of rhenium at the critical surface where they are needed
Solution Approach 2:
The patent employs composite materials by combining rhenium coating with substrate materials. The electrodeposited rhenium layer forms a composite structure with the underlying substrate, where the rhenium coating provides surface properties (corrosion resistance, wear resistance, high-temperature stability) while the substrate provides structural support, creating a composite material system that leverages the advantages of both materials
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 method enables the deposition of high-quality rhenium or rhenium alloy coatings on various substrates, providing enhanced properties such as corrosion resistance and wear resistance without the need for bulk rhenium, offering economic advantages.
Implementation Method 1
a method of electrodepositing a rhenium layer on a substrate
Implementation Method 2
the waveform is a pulse waveform or a pulse reverse waveform; the pulse waveform comprising a cathodic pulse and a period without current; the pulse reverse waveform comprising a cathodic pulse and an anodic pulse
Data Source
AI summary
Provided are methods of preparing electroplated articles having rhenium or rhenium alloy layers deposited thereon. The methods utilize pulse reverse waveforms to avoid hydrogen and rhenium oxide evolution. Articles prepared using the methods, and electrolyte solutions used in the methods, are also provided.