Provide PDF Format
PRCI PR-247-9511
- Effects of Phosphoric Acid Treatment on Performance of FBE Coating
- Report / Survey by Pipeline Research Council International, 10/12/1997
- Publisher: PRCI
$173.00$345.00
L51798e
Technical Inspections Services, Inc
Need: Fusion bonded epoxy coatings can be adversely affected by the presence of soluble contaminants on the blasted steel pipe surface. At the urging of the pipeline operating companies, FBE coating applicators have tried to increase the control of the uniformity and cleanliness of the abraded steel substrate. Although additional cleaning and treatment techniques are being employed at several coating mills, basic information was lacking on the long-term effects and impacts of the chemical pretreatments on FBE coating performance.
Benefit: The objective of this research was to develop data from comparative testing to evaluate the test performance (up to 28 day duration) of FBE pipe coatings when applied over contaminated as well as uncontaminated surfaces with and without phosphoric acid treatment. This project was based on a package drafted by Mr. E.G. Pierson, a former PRCI member employed by Exxon Pipeline Company. The scope of this work was adapted from the research guide lines in the original request for proposal (RFP). Some of these introductory comments were extracted from the RFP as well.
Result: The contamination sequence resulted in surface concentrations of chloride and sulfate that have been found to be detrimental by past experience and in other test programs. The nitrate levels were low after only hand wire brush preparation. The results of the microscopic examination, cure determinations and bend tests showed that all of the applied films would meet typical quality control testing on these properties. The primary aim of this project was to determine if the phosphoric acid wash would improve performance on the hot water soak and cathodic disbondment tests.
Technical Inspections Services, Inc
Need: Fusion bonded epoxy coatings can be adversely affected by the presence of soluble contaminants on the blasted steel pipe surface. At the urging of the pipeline operating companies, FBE coating applicators have tried to increase the control of the uniformity and cleanliness of the abraded steel substrate. Although additional cleaning and treatment techniques are being employed at several coating mills, basic information was lacking on the long-term effects and impacts of the chemical pretreatments on FBE coating performance.
Benefit: The objective of this research was to develop data from comparative testing to evaluate the test performance (up to 28 day duration) of FBE pipe coatings when applied over contaminated as well as uncontaminated surfaces with and without phosphoric acid treatment. This project was based on a package drafted by Mr. E.G. Pierson, a former PRCI member employed by Exxon Pipeline Company. The scope of this work was adapted from the research guide lines in the original request for proposal (RFP). Some of these introductory comments were extracted from the RFP as well.
Result: The contamination sequence resulted in surface concentrations of chloride and sulfate that have been found to be detrimental by past experience and in other test programs. The nitrate levels were low after only hand wire brush preparation. The results of the microscopic examination, cure determinations and bend tests showed that all of the applied films would meet typical quality control testing on these properties. The primary aim of this project was to determine if the phosphoric acid wash would improve performance on the hot water soak and cathodic disbondment tests.
Related Products
PRCI Report 136
Effect of Shot Peening and Grit Blasting on Stress-Corrsion-Cracking Behavior of Line Pipe Steel..
$198.00 $395.00
PRCI PR-262-9809
Cathodic Protection Considerations for Pipelines w/AC Mitigation Facilities..
$298.00 $595.00
PRCI PR-3-611
The Development of an Ultralow Frequency Eddy Current Instrument for the Detection and Sizing of Str..
$6.00 $12.00