Degradation of Powder Epoxy-Coated Panels Immersed in a Saturated Calcium Hydroxide Solution Containing Sodium Chloride

Martin, J.W.; Nguyen, T; Alsheh, D.; Lechner, James A.; Embree, E.; Byrd, E.; Seiler, J.; National Institute of Standards and Technology (U.S.)

Advanced Search

Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

Advanced Search
Custom Query

All these words:

For very narrow results

This exact word or phrase:

When looking for a specific result

Any of these words:

Best used for discovery & interchangable words

None of these words:

Recommended to be used in conjunction with other fields

Language:

Dates

Publication Date Range:

to

Document Data

Title:

Document Type:

Library

Collection:

Series:

People

Author:

Clear All

Query Builder

Query box

Clear All

For additional assistance using the Custom Query please check out our Help Page

i

Degradation of Powder Epoxy-Coated Panels Immersed in a Saturated Calcium Hydroxide Solution Containing Sodium Chloride

1995-10-01
By Martin, J.W. ; Nguyen, T ; Alsheh, D. ; ...

[PDF-737.70 KB]

English

Details You May Also Like

Details:

Creators:

Martin, J.W. ; Nguyen, T ; Alsheh, D. ; Lechner, James A. ; Embree, E. ; ... More +

Martin, J.W. ; Nguyen, T ; Alsheh, D. ; Lechner, James A. ; Embree, E. ; Byrd, E. ; Seiler, J. Less -
Corporate Creators:

National Institute of Standards and Technology (U.S.)
Contributors:

Virmani, Paul Y.
Corporate Contributors:

United States. Federal Highway Administration. Office of Engineering and Highway Operations R&D
Subject/TRT Terms:

[+]

Adhesion Cathodes Corrosion Epoxy Coatings Infrared Photography
Publication/ Report Number:

FHWA-RD-94-174
Resource Type:

Tech Report
Geographical Coverage:

United States
Corporate Publisher:

United States. Department of Transportation. Federal Highway Administration
Abstract:

Blasted-steel panels were coated with two commercial powder epoxy coatings. Approximately half (80) of the coated panels were scribed; while the other half remained defect-free. All of the panels were immersed in a saturated calcium hydroxide solution containing 3.5% sodium chloride maintained at either 35 or 50 deg C. None of the unscribed panels degraded after 3074 hr of immersion at 35 deg C; whereas, all of the scribed panels degraded within 24 hr after immersion, regardless of the immersion solution temperature. Scribed panels degraded in three ways: (1) anodic corrosion, (2) cathodic disbondment, and (3) wet-adhesion loss. Anodic corrosion was attributed to localized crevice corrosion. The rate of anodic growth depended on the immersion solution temperature, but it did not depend on the type of coating or coating thickness. Liquid-filled blisters formed above the anodic sites after approximately 1000 hr of immersion at 35 deg C. The chloride concentration of the blister fluid was four times greater than that of the bulk solution and its pH was around 5. The rate of cathodic disbondment was not affected by the type of coating or coating thickness, but it was greatly affected by an increase in the temperature of the immersion solution. Wet-adhesion loss was not affected by coating thickness, but it does depend on the type of coating and immersion temperature. Also, even though the wet-adhesion strength of the two coatings differed by a factor of five, the rate of corrosion for the two coatings was not significantly different.
Format:

PDF
Funding:

DTFH61-92-Y-30115
Collection(s):

Federal Highway Administration
Main Document Checksum:

[+]

urn:sha256:cd5ef03bd3b02a59488eedae48e7ff704feb9048e66b88b58fccc3959ccc33d5
Download URL:

https://rosap.ntl.bts.gov/view/dot/68110/dot_68110_DS1.pdf
File Type:

No Additional Files

More +

Degradation of Powder Epoxy-Coated Panels Immersed in a Saturated Calcium Hydroxide Solution Containing Sodium Chloride

Details:

Supporting Files

You May Also Like