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Stainless steel is selected for use in the municipal waterworks industry because of its inherent corrosion resistance properties. Designers oftentimes overlook the associated problems with coupling stainless steel with carbon steel metals. When these materials are electrically connected and placed into aqueous environments (immersion service) accelerated corrosion of the anodic carbon steel metal is initiated.
Stainless steel is selected for use in the municipal waterworks industry because of its inherent corrosion resistance properties. Designers oftentimes overlook the associated problems with coupling stainless steel with carbon steel metals. When these materials are electrically connected and placed into aqueous environments (immersion service) accelerated corrosion of the anodic carbon steel metal is initiated. This paper will review the galvanic (bi-metallic) corrosion theory, present the results from a galvanic coupling study, and provide examples where bare stainless steel and coated carbon steel metals were coupled in water and wastewater structures.
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The installation of protective coating systems must be accomplished in a manner that will avoid adverse electrolytic coupling between dissimilar metals in water tanks, process equipment, and even some atmospheric applications where condensing humidity and rainwater provide the aqueous medium for electrolytes. This paper discusses several examples of premature coating and structural failures resulting from the mixing of dissimilar metal types in systems where the anode and cathode areas are not optimized by design or engineering controls.
Results of laboratory testing of a new technology for mitigating galvanic corrosion. Incorporated into a device, referred to as the galvanic corrosion inhibiting coupling (GCIC) or bi-electrode device (BED), it creates an ohmic potential drop within the pipe and minimizes the polarization of the dissimilar metals.