Corrosion Inhibitor Titanium Alloy Electrode for Chloride Environments
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Solution Overview
Problem
Conventional titanium electrodes used in electrowinning processes suffer from high corrosion rates due to chloride ions, leading to premature failure and reduced lifespan, as the catalytic layer detaches from the substrate when corrosion damages the titanium substrate.
Innovation Solution
A corrosion inhibitor-containing titanium alloy substrate with an iridium oxide or iridium-tantalum mixed oxide catalytic layer and a titanium-tantalum alloy interlayer is used, along with a tantalum oxide catalytic base layer, to enhance corrosion resistance and extend the electrode's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional titanium substrate is used as the electrode base, then the electrode can provide electrical support and mechanical strength, but the substrate suffers from high corrosion rates in chloride ion environments, leading to premature failure and reduced lifespan
Solution Approach 1:
A corrosion inhibitor layer comprising platinum group metals (such as ruthenium, rhodium, or osmium) is introduced as an intermediary between the titanium substrate and the chloride ion environment. This inhibitor layer acts as a protective mediator that reduces the direct corrosive interaction between chloride ions and the titanium substrate, thereby extending electrode lifespan without compromising electrical or mechanical performance
Solution Approach 2:
The electrode is designed as a composite structure combining titanium substrate with a corrosion inhibitor layer containing platinum group metals. This composite material approach leverages the electrical and mechanical properties of titanium while adding the corrosion resistance properties of platinum group metals, creating a multi-functional material system that simultaneously provides structural integrity, electrical conductivity, and enhanced corrosion resistance
2Reliability
If the substrate corrosion is severe, then the catalytic layer will detach from the substrate, but this detachment causes the anode to stop functioning and reduces lifetime
Solution Approach 1:
The corrosion inhibitor layer serves as a protective intermediary that prevents severe corrosion damage to the titanium substrate. By reducing the corrosion rate at the substrate level, this intermediate layer maintains the structural integrity of the substrate-catalytic layer interface, preventing catalytic layer detachment and ensuring continuous anode functionality throughout the extended electrode lifespan
3Object-affected harmful factors
If a corrosion inhibitor layer is added to the electrode structure, then corrosion resistance is improved, but the device complexity increases
Solution Approach 1:
The electrode is segmented into distinct functional layers: the titanium substrate providing structural support and electrical conductivity, and the corrosion inhibitor layer comprising platinum group metals providing corrosion protection. This segmentation allows each layer to be optimized for its specific function while maintaining overall system simplicity through clear functional separation and modular construction
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 improved electrode design significantly reduces corrosion rates and extends the lifespan of the electrodes while reducing production costs, as demonstrated by accelerated lifetime tests showing increased durability and performance in chloride ion environments.
Implementation Method 1
the substrate is a corrosion inhibitor-containing titanium alloy, the corrosion inhibitor being selected from at least one metal of platinum, palladium, osmium, iridium, ruthenium, rhodium, tantalum, zirconium and niobium
Implementation Method 2
the catalyst layer can greatly reduce oxygen evolution potential through its own redox process to save energy
Implementation Method 3
an interlayer is disposed between the substrate and the catalytic layer, the interlayer being a titanium-tantalum alloy layer
Data Source
AI summary
An electrode, and use and a preparation method thereof. The electrode includes a metal substrate and a catalytic layer. The electrode includes at least one of the following features: i) the substrate is a corrosion inhibitor-containing titanium alloy, the corrosion inhibitor being selected from at least one metal of platinum, palladium, osmium, iridium, ruthenium, rhodium, tantalum, zirconium and niobium, and the content of the corrosion inhibitor being 0.05 wt %-0.5 wt % of the total mass of the alloy; ii) the catalytic layer is an iridium oxide layer or an iridium-tantalum mixed oxide layer, with a mass ratio of iridium element to tantalum element being 1:4 to 1:0; and iii) an interlayer is disposed between the substrate and the catalytic layer, the interlayer being a titanium-tantalum alloy layer. For the electrode, its corrosion resistance is greatly improved, its lifetime is extended, and its production cost is reduced.