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

PB96101050

Publication Date	1995
Personal Author	Martin, J. W.; Nguyen, T.; Alsheh, D.; Lechner, J. A.; Embree, E.; Byrd, E.; Seiler, J.
Page Count	46
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 percent sodium chloride maintained at either 35 or 50 deg. C. None of the unscribed panels degraded after 3074 h of immersion at 35 deg C; whereas, all of the scribed panels degraded within 24 h 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.
Keywords	Reinforcing steels Bars Epoxy coatings Immersion test(Corrosion) Corrosion Marine environments Chemical attack Degradation Protective coatings Peeling Exfoliation corrosion Blistering Calcium hydroxides Sodium chloride Thermography Anodic blisters Cathodic disbondment Wet adhesion Infrared thermography
Source Agency	Federal Highway Administration
NTIS Subject Category	50A - Highway Engineering 71E - Coatings, Colorants, & Finishes 71G - Corrosion & Corrosion Inhibition 41E - Manufacturing, Planning, Processing & Control
Corporate Authors	National Inst. of Standards and Technology (BFRL), Gaithersburg, MD. Building Materials Div.; Federal Highway Administration, McLean, VA. Office of Engineering and
Supplemental Notes	Sponsored by Federal Highway Administration, McLean, VA. Office of Engineering and Highway Operations Research and Development.
Document Type	Technical Report
Title Note	Final rept. Aug 92-Jul 94.
NTIS Issue Number	199601
Contract Number	DTFH61-92-Y-30115

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

Degradation of Powder Epoxy Coated Panels Immersed in a Saturated Calcium Hydroxide Solution Containing Sodium Chloride.
PB96101050

Publication Date	1995
Personal Author	Martin, J. W.; Nguyen, T.; Alsheh, D.; Lechner, J. A.; Embree, E.; Byrd, E.; Seiler, J.
Page Count	46
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 percent sodium chloride maintained at either 35 or 50 deg. C. None of the unscribed panels degraded after 3074 h of immersion at 35 deg C; whereas, all of the scribed panels degraded within 24 h 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.
Keywords	Reinforcing steels Bars Epoxy coatings Immersion test(Corrosion) Corrosion Marine environments Chemical attack Degradation Protective coatings Peeling Exfoliation corrosion Blistering Calcium hydroxides Sodium chloride Thermography Anodic blisters Cathodic disbondment Wet adhesion Infrared thermography
Source Agency	Federal Highway Administration
NTIS Subject Category	50A - Highway Engineering 71E - Coatings, Colorants, & Finishes 71G - Corrosion & Corrosion Inhibition 41E - Manufacturing, Planning, Processing & Control
Corporate Authors	National Inst. of Standards and Technology (BFRL), Gaithersburg, MD. Building Materials Div.; Federal Highway Administration, McLean, VA. Office of Engineering and
Supplemental Notes	Sponsored by Federal Highway Administration, McLean, VA. Office of Engineering and Highway Operations Research and Development.
Document Type	Technical Report
Title Note	Final rept. Aug 92-Jul 94.
NTIS Issue Number	199601
Contract Number	DTFH61-92-Y-30115