Menu
Search
Filters
Close
Menu

Save 20% on select titles with code HIDDEN24 - Shop The Sale Now

51318-11369- Experiments and Mathematical Modeling to Assess the Effect of Cathodic Protection Coupon Geometry and Size on Current Distribution

Picture for 51318-11369- Experiments and Mathematical Modeling to Assess the Effect of Cathodic Protection Coupon Geometry and Size on Current Distribution
Available for download

Experiments and corrosion modeling were conducted - with 10, 50, and 100 cm2 coupons in circular, triangular, and cylindrical shapes - to develop an approach to evaluate optimal cathodic protection (CP) coupon size and shape for monitoring CP in field.

Product Number: 51318-11369-SG
Author: Xihua S. He / Pavan K. Shukla / Andrew Norquist
Publication Date: 2018
Industry: Cathodic Protection
$0.00
$20.00
$20.00

  

 

 

 

This study was conducted to determine optimal coupon size and shape of the coupons with minimal edge effect in terms of cathodic current distribution. Specifically, experiments and corrosion modeling were conducted to develop an approach to evaluate optimal cathodic protection (CP) coupon size and shape for monitoring CP in field. Experiments were conducted with 10, 50, and 100 cm2 coupons in circular, triangular, and cylindrical shapes. The experiments included linear polarization resistance, potentiodynamic cathodic polarization, and potentiostatic polarization measurements. The experimental cells used in the experiments were modeled for the current distribution at the coupons surfaces. The pH of the sand directly next to the coupons surface was measured, which was found to be more basic than the bulk sand pH, indicating that cathodic currents resulted in generation of alkalinity which was absorbed by the sand. The experimental data were input in a pipeline CP model that included a 10 cm2 holiday and a coupon with varying sizes and shapes. The coupon sizes and shapes included a factorial combination of 10, 50, and 100 cm2 surface areas and circular and cylindrical shapes. The simulation data indicated that edge effects are minimal for a 10 cm2 cylindrical coupon and 100 cm2 circular coupon under various cathodic polarization conditions.

Key words: Cathodic protection, coupon, size, geometry

 

  

 

 

 

This study was conducted to determine optimal coupon size and shape of the coupons with minimal edge effect in terms of cathodic current distribution. Specifically, experiments and corrosion modeling were conducted to develop an approach to evaluate optimal cathodic protection (CP) coupon size and shape for monitoring CP in field. Experiments were conducted with 10, 50, and 100 cm2 coupons in circular, triangular, and cylindrical shapes. The experiments included linear polarization resistance, potentiodynamic cathodic polarization, and potentiostatic polarization measurements. The experimental cells used in the experiments were modeled for the current distribution at the coupons surfaces. The pH of the sand directly next to the coupons surface was measured, which was found to be more basic than the bulk sand pH, indicating that cathodic currents resulted in generation of alkalinity which was absorbed by the sand. The experimental data were input in a pipeline CP model that included a 10 cm2 holiday and a coupon with varying sizes and shapes. The coupon sizes and shapes included a factorial combination of 10, 50, and 100 cm2 surface areas and circular and cylindrical shapes. The simulation data indicated that edge effects are minimal for a 10 cm2 cylindrical coupon and 100 cm2 circular coupon under various cathodic polarization conditions.

Key words: Cathodic protection, coupon, size, geometry

 

Product tags
Also Purchased
Picture for 51318-11271- AC Corrosion Control: When Too Much Cathodic Protection Might Just be a Bad Thing!
Available for download

51318-11271- AC Corrosion Control: When Too Much Cathodic Protection Might Just be a Bad Thing!

Product Number: 51318-11271-SG
Author: Dale Lindemuth / Dan Crabtree
Publication Date: 2018
$20.00

Case histories where throttling down the cathodic protection was evaluated to determine the impact on reducing the AC corrosion threat. Includes the use of fast-response electrical resistance corrosion rate probe monitoring technology.
Picture for Cathodic Protection Coupon Use for Buried Piping in Plant (i.e. Complex) Facilities
Available for download

Cathodic Protection Coupon Use for Buried Piping in Plant (i.e. Complex) Facilities

Product Number: 51317--8824-SG
ISBN: 8824 2017 CP
Author: Douglas Gilroy
Publication Date: 2017
$20.00

Measurement and interpretation of cathodic protection data in plant facilities present challenges where mixed metals are electrically continuous with the protected structure. This paper address some of the confusion and important aspects when using coupons for buried piping in mixed-metal circuits.
Picture for Cathodic Protection and MIC - Effects of local electrochemistry
Available for download

Cathodic Protection and MIC - Effects of local electrochemistry

Product Number: 51317--9452-SG
ISBN: 9452 2017 CP
Author: Stefan Jansen
Publication Date: 2017
$20.00

The goal of this research was to improve the understanding of the mechanisms of cathodic protection (CP) by determining the interactions between corrosion and local chemical parameters, such as pH, under varying CP conditions, both in the absence and presence of MIC.
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support