Server maintenance is scheduled for Saturday, December 21st between 6am-10am CST.

During that time, parts of our website will be affected until maintenance is completed. Thank you for your patience.

Menu
Search
Filters
Close
Menu

51318-10965-Evaluation of Corrosion Inhibitor Functionality on the Mitigation of Preferential Weld Corrosion

Picture for Evaluation of Corrosion Inhibitor Functionality on the Mitigation of Preferential Weld Corrosion
Available for download

The work conducted produced conditions where preferential weld corrosion initiated in uninhibited conditions and was sustained throughout inhibition. Two types of weld metallurgies; one weld consumable with 1% nickel, the second matched the parent pipe.

Product Number: 51318-10965-SG
Author: R. Barson / D. D. Korwin-Kochanowski / S. Turgoose / G. Economopoulos / G. E. Dicken
Publication Date: 2018
Industry: Pipelines, Tanks, and Underground Systems
$0.00
$20.00
$20.00

Preferential weld corrosion (PWC) is a well-documented phenomenon. The composition of the weld consumable or the post welding microstructure of the carbon steel parent pipe can contribute towards the attack. PWC can be prevented or mitigated by selection of a suitable corrosion inhibitor. However, uniform inhibitor filming cannot be guaranteed and sensitivity to weld metal composition is possible with some chemicals. Weld metal sensitivity can induce or exacerbate the problem.

The work conducted produced conditions where preferential weld corrosion initiated in uninhibited conditions and was sustained throughout inhibition. Two types of weld metallurgies were evaluated; the principle difference being that one weld consumable contained nominally 1% nickel whilst the second was welded with a parent pipe matching consumable.

The performance of two generic corrosion inhibitor formulations was assessed; a sulphur-containing chemical - a quaternary amine with thioglycolic acid synergist, and a non-sulphur containing chemical, consisting of imidazoline and a phosphate ester. The influence of the functionality of the compounds versus PWC mitigation was examined. In addition, the effect of the precorrosion period on the concentration of corrosion inhibitor required to mitigate corrosion was investigated.

Keywords: Preferential weldment corrosion, matching consumable weld, nominal 1% nickel weld, galvanic current, precorrosion, corrosion inhibition, carbon dioxide.

Preferential weld corrosion (PWC) is a well-documented phenomenon. The composition of the weld consumable or the post welding microstructure of the carbon steel parent pipe can contribute towards the attack. PWC can be prevented or mitigated by selection of a suitable corrosion inhibitor. However, uniform inhibitor filming cannot be guaranteed and sensitivity to weld metal composition is possible with some chemicals. Weld metal sensitivity can induce or exacerbate the problem.

The work conducted produced conditions where preferential weld corrosion initiated in uninhibited conditions and was sustained throughout inhibition. Two types of weld metallurgies were evaluated; the principle difference being that one weld consumable contained nominally 1% nickel whilst the second was welded with a parent pipe matching consumable.

The performance of two generic corrosion inhibitor formulations was assessed; a sulphur-containing chemical - a quaternary amine with thioglycolic acid synergist, and a non-sulphur containing chemical, consisting of imidazoline and a phosphate ester. The influence of the functionality of the compounds versus PWC mitigation was examined. In addition, the effect of the precorrosion period on the concentration of corrosion inhibitor required to mitigate corrosion was investigated.

Keywords: Preferential weldment corrosion, matching consumable weld, nominal 1% nickel weld, galvanic current, precorrosion, corrosion inhibition, carbon dioxide.

Product tags
Also Purchased
Picture for 05277 Preferential Weld Corrosion: Effects of
Available for download

05277 Preferential Weld Corrosion: Effects of Weldment Microstructure and Composition

Product Number: 51300-05277-SG
ISBN: 05277 2005 CP
Author: Chi-Ming Lee and Paul Woollin, TWI Ltd.
$20.00
Picture for Evaluation of Preferential Weld Corrosion Susceptibility and Its Mitigation in Slightly Sour Conditions
Available for download

Evaluation of Preferential Weld Corrosion Susceptibility and Its Mitigation in Slightly Sour Conditions

Product Number: 51315-5640-SG
ISBN: 5640 2015 CP
Author: Ray Case
Publication Date: 2015
$20.00

Preferential Weld Corrosion (PWC) susceptibility was studied in a slightly sour wet gas piping system using electrochemical methods based on the “hockey puck” technique. Several corrosion inhibitors were evaluated to assess their performance in suppressing PWC.
Picture for 11268 Control of Preferential Weld Corrosion of X65 Pipeline Steel in Flowing Brines
Available for download

11268 Control of Preferential Weld Corrosion of X65 Pipeline Steel in Flowing Brines Containing Carbon Dioxide

Product Number: 51300-11268-SG
ISBN: 11268 2011 CP
Author: Mylene Martinez, Khaled Alawadhi, Michael Robinson, Graham Nelson and Andrew MacDonald
Publication Date: 2011
$20.00
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