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Combatting Localized Galvanic Corrosion at Bolted Connections in Gravity Sludge Thickeners and Clarifiers in Wastewater Treatment Plants

Combatting Localized Galvanic Corrosion at Bolted Connections in Gravity Sludge Thickeners and Clarifiers in Wastewater Treatment Plants
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This paper will describe this commonplace corrosion problem associated with protective coating damage at dissimilar metal bolted connections and present a typical case history. The paper will go on to explain why slotted bolt holes are more susceptible to more aggressive corrosion damage than round bolt holes. In addition, the paper will present successful measures that can be taken to prevent this prevalent problem. 

Product Number: 51220-269-SG
Author: R. A. Nixon
Publication Date: 2020
Industries: Corrosion Monitoring and Control , Coatings
$0.00
$20.00
$20.00

This paper will describe this commonplace corrosion problem associated with protective coating damage at dissimilar metal bolted connections and present a typical case history. The paper will go on to explain why slotted bolt holes are more susceptible to more aggressive corrosion damage than round bolt holes. In addition, the paper will present successful measures that can be taken to prevent this prevalent problem. Those measures include proper coating system selection, the use of non-metallic washers with stainless steel washers, reducing the number of bolted connections, and application of a flexible polysulfide sealant to seal bolted connections following proper coating application.

This paper will describe this commonplace corrosion problem associated with protective coating damage at dissimilar metal bolted connections and present a typical case history. The paper will go on to explain why slotted bolt holes are more susceptible to more aggressive corrosion damage than round bolt holes. In addition, the paper will present successful measures that can be taken to prevent this prevalent problem. Those measures include proper coating system selection, the use of non-metallic washers with stainless steel washers, reducing the number of bolted connections, and application of a flexible polysulfide sealant to seal bolted connections following proper coating application.

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Compating Corrosion of Nuts & Bolts (Support Rods & Fasteners)
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Compating Corrosion of Nuts & Bolts (Support Rods & Fasteners)

Product Number: 51220-244-SG
Author: John Glass, Edwin Welles
Publication Date: 2020
$20.00

The presentation will discuss the challenges, overall objective and unique characteristics of the viscous-elastic semi-solid compound and bolt cap protection system. Testing, installation procedures and previous projects will be covered. One of the projects to be covered is the system used to protect the support rods of the recently constructed San Francisco Bay Bridge connecting Oakland to San Francisco. The bridge made the news prior to opening when it was determined that a portion of the support rods were experiencing fatigue and showing signs of premature failure.
Coating System Test Patches and Mock-Ups: Value to the Specifier and Your Own Client
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Coating System Test Patches and Mock-Ups: Value to the Specifier and Your Own Client

Product Number: 51220-284-SG
Author: Bill Seavy, David C. Hall
Publication Date: 2020
$20.00

The authors will discuss the importance of applying and specifying coating system mock-ups and test patches for successful painting project completion and owner satisfaction. Why risk any delay during the project or owner dissatisfaction with the project after everything is finished? Overlooking and/or not requiring mock-ups and test patches on key projects and critical areas can result in problems before, during and after the project has been completed. 
A New Protocol for Evaluating the Effectiveness of Coatings Used to Reduce Corrosion of Steel Structures
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A New Protocol for Evaluating the Effectiveness of Coatings Used to Reduce Corrosion of Steel Structures

Product Number: 51220-295-SG
Author: Giri Venkiteela, Perumalsamy Balaguru
Publication Date: 2020
$20.00

Details of a new protocol for evaluating the effectiveness of coatings to reduce corrosion of steel structures is presented in this paper. Basic concepts of accelerated testing specified in American Society for Testing Materials (ASTM) standards and recent research investigations were used to develop a procedure that can provide conclusive results within 2400 hours of exposure as compared to more than 5000 hours in current practices. 
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