PaintSquare.com


The First Word in Protective & Marine Coatings

A Product of Technology Publishing / PaintSquare
JPCL | PaintSquare News | Durability + Design | Paint BidTracker


G42 Standard Test Method for Cathodic Disbonding of Pipeline Coatings Subjected to Elevated Temperatures

All Standards | ASTM Standards
Search Standards


Click to Purchase and Download this Standard or Test Method

Revision Date: January 20, 2012
Updated On: January 20, 2012
Editorial Change:
 
Damage to pipe coating is almost unavoidable during transportation and construction. Breaks or holidays in pipe coatings may expose the pipe to possible corrosion since, after a pipe has been installed underground, the surrounding earth will be moisture-bearing and will constitute an effective electrolyte. Applied cathodic protection potentials may cause loosening of the coating, beginning at holiday edges. Spontaneous holidays may also be caused by such potentials. This test method provides accelerated conditions for cathodic disbondment to occur and provides a measure of resistance of coatings to this type of action.

The effects of the test are to be evaluated by physical examinations and monitoring the current drawn by the test specimen. Usually there is no correlation between the two methods of evaluation, but both methods are significant. Physical examination consists of assessing the effective contact of the coating with the metal surface in terms of observed differences in the relative adhesive bond. It is usually found that the cathodically disbonded area propagates from an area where adhesion is zero to an area where adhesion reaches the original level. An intermediate zone of decreased adhesion may also be present.

Assumptions associated with test results include:

Maximum adhesion, or bond, is found in the coating that was not immersed in the test liquid, and

Decreased adhesion in the immersed test area is the result of cathodic disbondment.

Ability to resist disbondment is a desired quality on a comparative basis, but disbondment in this test method is not necessarily an adverse indication of coating performance. The virtue of this test method is that all dielectric-type coatings now in common use will disbond to some degree, thus providing a means of comparing one coating to another.

(Back to all Standards)

 
   

LS Industries
LS Blasters: Optimum Steel Cleaning Efficiency

Simplify surface prep with the precise shot control of LS Blasters. Our blast technology delivers optimum coverage and finish. 800-533-8008


Denso North America Inc.
Denso Tank Base
Protection System

An easily applied prevention system, utilizing Denso tapes and coatings around the tank base, that helps prevent corrosion from external elements.
Call 1-281-821-3355 or Visit www.densona.com


Spider, a Division of SafeWorks, LLC
Spider’s Competent Person Training

What will Spider’s CPT class do for you?
• OSHA compliance
• Increased productivity
• Improved safety
   awareness
• Fewer accident-related
   costs
Call 877-774-3370 or click for classes near you.


CESCO
DELIVERY ANYWHERE - BEST PRICING - FAST!

Lighten your load by buying 50lb. bags at bulk rates. From 50lb. bags to Jumbo Sacks to Bulk Loads, CESCO provides packaging to meet your specific job requirements.
Contact us: 888-772-3726 BlastandPaint.com


Wasser High-Tech Coatings Inc.
Wasser Coatings Protect

some of the most important bridges in the country; learn about our NEPCOAT-approved system and our entire range of MCU & Polyurea coatings. 1-800-627-2968 www.wassercoatings.com


Axxiom Manufacturing
The Undisputed
Industry Leader.

Proven Innovation. Job Performance. Industry Training. Workplace Safety. Only Schmidt® abrasive blast equipment by Axxiom Manufacturing delivers it all!


Blastrac
HORIZONTAL AND VERTICAL SHOT BLASTING SYSTEMS

The 900VMB is the latest in Vertical Steel Shot Blasters, ideally suited for medium and large- sized vertical steel blast cleaning jobs and applications. It is remote controlled for operator safety, comfort, and productivity. See Video.
1-800-256-3440 www.blastrac.com

 
 
 
Technology Publishing

The Technology Publishing Network

The Journal of Protective Coatings & Linings (JPCL) PaintSquare
Durability + Design Paint BidTracker JPCL Europe

 
EXPLORE:      JPCL   |   PaintSquare News   |   Interact   |   Buying Guides   |   Webinars   |   Resources   |   Classifieds
REGISTER AND SUBSCRIBE:      Free PaintSquare Registration   |   Subscribe to JPCL   |   Subscribe to PaintSquare News
MORE:      About PaintSquare.com   |   Privacy policy   |   Terms & conditions   |   Site Map   |   Search   |   Contact Us
 

© Copyright 2000-2014, Technology Publishing / PaintSquare, All rights reserved
2100 Wharton Street, Suite 310, Pittsburgh PA 15203-1951; Tel 1-412-431-8300; Fax 1-412-431-5428; E-mail webmaster@paintsquare.com