Marine Corrosion Control via Intermittent Current Interruption
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Solution Overview
Problem
Existing corrosion protection systems for marine constructions face measurement errors due to IR drops when using reference electrodes as a ground reference, which can lead to suboptimal corrosion protection and are often inflexible in arrangement.
Innovation Solution
The system intermittently reduces or eliminates electrical currents between anodes and metal parts during potential measurements, allowing for accurate voltage readings without interference, and allows for flexible placement of reference electrodes, enabling precise control of corrosion protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous electrical current is maintained between anode and metal part for corrosion protection, then corrosion protection is provided, but measurement errors occur due to IR drops affecting potential readings
Solution Approach 1:
The system implements periodic interruption of the protective current to perform potential measurements. The control unit alternates between applying current for corrosion protection and interrupting current to measure the electrical potential of the metal part, thereby eliminating IR drop errors during measurement while maintaining overall protection effectiveness
Solution Approach 2:
The system performs potential measurements at predetermined intervals during which the protective current is temporarily interrupted. This preliminary scheduling of measurement moments ensures accurate readings are taken when no current flows, preventing measurement errors before they affect the control decision
2Measurement precision
If reference electrode is placed close to metal part for accurate measurement, then measurement accuracy improves, but arrangement flexibility is reduced
Solution Approach 1:
The invention extracts the measurement function from the continuous current application by separating the measurement moment from the protection moment. The reference electrode can remain in a fixed position while the control unit interrupts current during measurements, eliminating the need to relocate the electrode for accurate readings and thereby maintaining arrangement flexibility
3Reliability
If multiple corrosion protection systems are used for different metal parts, then comprehensive protection is achieved, but measurement interference between systems increases
Solution Approach 1:
The control unit coordinates periodic current interruption across multiple corrosion protection systems to perform measurements. By synchronizing or sequencing the interruption of currents from different anodes, the system eliminates mutual interference during potential measurements while maintaining protection during non-measurement periods
Solution Approach 2:
The system segments the operation into distinct measurement phases and protection phases for each corrosion protection circuit. During measurement of one metal part, the control unit interrupts current not only in that circuit but also in other circuits to prevent measurement interference, thereby ensuring accurate readings across all systems
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
This approach significantly reduces measurement errors and enhances the accuracy of corrosion protection, allowing for a compact and flexible arrangement of components while preventing excessive underwater growth.
Implementation Method 1
a measured first electrical potential of the first metal part with at least one of the at least one reference electrode as a ground reference
Implementation Method 2
a surface polarization at the interface between the metal part and the water is created, serving to protect the metal part against corrosion
Implementation Method 3
a circuit is provided by an electrical current through the water serving as an electrolyte
Data Source
AI summary
A method in a corrosion protection system for protecting a first and a second metal part of a marine construction is provided. The method includes controlling electrical currents through electrical circuits, including respective anodes, the respective metal parts and an electrolyte, at least partly based on measured electrical potentials of the respective metal parts with an reference electrode as a ground reference. The method further includes repetitively performing the steps of controlling the electrical currents so as to be reduced or eliminated, measuring the electrical potentials while the electrical currents are maintained reduced or eliminated, and, after measuring the first and second electrical potentials, controlling the electrical currents so as to be increased or reestablished.