Ag/AgCl Chloride Sensor Coating for Under Deposit Corrosion Detection
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Solution Overview
Problem
Existing sensors are unable to accurately detect chloride ion concentrations under various types of deposits, leading to inefficiencies in monitoring under deposit corrosion (UDC) in oil and gas pipelines, which is a significant cause of economic loss and safety hazards.
Innovation Solution
A modified Ag/AgCl electrode with a polarized surface coated with a composite organic-inorganic compound, featuring AgCl particles and hierarchical pores, is developed for sensitive chloride ion detection in sour media, using a fabrication process involving electrochemical polarization and polymerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ion selective electrodes are used for measuring chloride concentrations, then basic measurement capability is provided, but accurate detection under various types of deposits cannot be achieved
Solution Approach 1:
The electrode surface is modified with specific functional materials (ionophores, conductive polymers, or nanomaterials) that create localized regions with enhanced chloride ion selectivity and sensitivity. This local modification allows the sensor to accurately detect chloride ions even when covered by various deposit layers, resolving the contradiction between measurement precision and adaptability under different deposit conditions.
Solution Approach 2:
The electrode employs composite material structures combining multiple functional components (e.g., conductive polymers with ionophores, or metal oxides with carbon nanomaterials) that work synergistically to maintain chloride detection accuracy under deposits. The composite structure provides both the selectivity needed for precise measurement and the robustness required for adaptability under various corrosive environments and deposit types.
2Measurement precision
If sensor complexity is increased to improve detection accuracy, then measurement precision improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention extracts and isolates the essential function of chloride ion detection by modifying only the electrode surface layer while maintaining the simple bulk electrode structure. This surface modification approach achieves high measurement precision without requiring complex internal structures, thus improving detection accuracy while minimizing device complexity.
Solution Approach 2:
The electrode utilizes parameter changes in the surface layer properties (such as conductivity, ionophoric activity, or surface charge) to achieve enhanced detection precision. By modifying surface parameters rather than restructuring the entire device, the patent achieves high measurement accuracy with minimal increase in device complexity.
3Measurement precision
If the sensor is designed for high sensitivity detection, then detection limit is improved, but stability and durability under harsh conditions may deteriorate
Solution Approach 1:
The electrode employs stable inorganic or hybrid materials that replicate the ion-selective functionality of more sensitive but less stable organic materials. For example, using metal oxide nanomaterials or conductive polymer composites that maintain both high chloride detection sensitivity and thermal/pressure stability, thus achieving low detection limits while ensuring reliability under harsh oil and gas conditions.
Solution Approach 2:
The electrode incorporates porous material structures (such as mesoporous metal oxides or porous conductive polymers) that provide high surface area for enhanced sensitivity and low detection limits, while the porous structure also facilitates heat dissipation and pressure equalization, improving stability and durability under high temperature and pressure conditions.
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 sensor provides accurate and selective detection of chloride ions, with a detection limit of 0.0001 to 1 M, and is durable, cost-effective, and functional under high temperatures and pressures, enabling effective monitoring of UDC.
Implementation Method 1
The sensor may be used to detect ions. The sensor may be used to detect chloride ions in a concentration ranging from about 0.0001 M to about 1 M. The sensor potential may decrease systematically with an increasing chloride concentration.
Implementation Method 2
The ions transfer of corrosive species and byproducts through the deposit layer are a reference of UDC. Therefore, it will be expected that pH and chloride concentration in covered areas is unequaled that in uncovered areas if the corrosion rate is controlled by diffusion of the reactants
Implementation Method 3
There are several types of ion selective electrodes for measuring chloride concentrations
Data Source
AI summary
A novel metal-based ion-selective electrode sensor for the detection of under deposit corrosions in sour media is disclosed. The sensor can be fabricated by the sequencing electrochemical polarization followed by functionalization with an organic-inorganic layer via impregnation and polymerization. The hybrid modified multifunctional sensor allows successful selective screening and monitoring of the concertation of soluble chloride ions in sour and sweet media. The sensor is portable, durable, cost-effective, and feasible for practical commercial utilizations.