PaintSquare.com
      | Connect Follow us on Twitter Like us on Facebook
About | Subscribe | Advertise
  

 


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)

 
   

SAFE Systems, Inc.
Portable Blast &
Recovery Equipment

Trailer or skid mounted blast and recovery equipment. Systems designed for maximum versatility, environmental compliance
and overall cost savings.
Call 1-800-634-7278


Novatek Corporation
Dustless Coatings Removal

Strip it, clean it, and profile it,
all dust free! High production
rates and Blast like finishes.
Comply with new lead
standards.


Safway Services
Suspended Access Made Easy With QuikDeck™

The smart choice for suspended access, QuikDeck’s interchangeable, lightweight components make them easy to set up and reassemble when you need to move.


Nationwide Overspray
Profession Overspray Removal Services

The Finest Name in Safe Overspray Removal. We specialize in removing all contaminants from any surface. Family Owned and Operated for 33 years! Fully insured. Satisfaction is guaranteed.


NACE International, The Corrosion Society
Get the Basics Anytime, Anywhere!

Take this online training to eliminate juggling your work schedule with continuous education. Learn corrosion causes, types, and how it can be controlled.


Industrial Vacuum Equipment Corp.
Hurricane Vacuums
& Dust Collectors

Vacuum and dust collector hose, filters and related accessories.
IndustrialVacuum.com


Easy-Kleen Pressure Systems Ltd.
HIGH PRESSURE HOT WATER/STEAM UNITS

3000 to 8000 PSI ALL IN ONE: Water tank, reels and unit enclosed in an industrial skid frame. Call Today and ask about the Fill & Play Series 1-800-315-5533


Modern Safety Techniques
Modern Safety Techniques

See our Low Temperature Catalyst for your CO removal needs. Help to provide your workers with safe, comfortable breathing air!


Abrasives Inc.
Check our Prices for Blast Abrasives

Faced with higher abrasive costs? We invite you to call & check our rates on Black Magic® coal slag and other quality blast materials. Abrasives Inc. 800-584-7524


RBW Enterprises, Inc.
Robotic Blast Cleaning & Painting News

RBW Enterprises has the only portable blast cleaning machine that can clean both horizontal and vertical surfaces, and pipe See more Videos at www.rbwe.com

 
 
 
Technology Publishing

The Technology Publishing Network

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

 
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 2000-2016, 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