Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/41640

Title

Thermal sprayed polymer coatings for corrosion protection in a biochemical treatment process

Author(s)

Allan, Margaret L.;  Berndt, Christopher C.;  Brogan, Jeffrey A.;  Otterson, D.

Abstract

Thermal sprayed ethylene methacrylic acid (EMAA) and ethylene tetrafluoroethylene (ETFE) coatings were evaluated for corrosion protection in a biochemical process to treat geothermal residues. Coupon, Atlas cell, peel strength and cathodic disbondment tests were performed in aggressive environments including geothermal sludge, hypersaline brine and sulfur oxidizing bacteria (Thiobacillus ferrooxidans) to determine coating suitability for protecting storage tanks and reaction vessels. It was found that the polymers were resistant to chemical attack and biodegradation at the test temperature of 55°C. The EMAA coatings protected 316L stainless steel from corrosion in coupon tests. However, corrosion of mild steel substrates coated with EMAA and ETFE occurred in Atlas cell tests that simulated a lined reactor operating environment and this resulted in decreased adhesive strength. Peel tests revealed that failure mode was dependent on exposure conditions. Cathodic disbondment tests in brine at room temperature indicated that EMAA coatings are resistant to disbondment at applied potentials of -780 to -1070 mV SCE for the test conditions and duration.

Publication type

Conference paper

Source

Thermal spray: meeting the challenges of the 21st century: proceedings of the 15th International Thermal Spray Conference, Nice, France, 25-29 May 1998 / Christian Coddet (ed.), Vol. 1, pp. 13-18

Publication year

1998

Keyword(s)

Bacteria;  Biochemical treatment process;  Biochemistry;  Biodegradation;  Cathodic disbondment tests;  Cathodic protection;  Chemical attack;  Chemical bonds;  Combustion;  Computer simulation;  Corrosion protection;  EMAA;  ETFE coatings;  Ethylene methacrylic acid;  Ethylene tetrafluoroethylene coatings;  Fluidized beds;  Organic polymers;  Radioisotopes;  Sprayed coatings

Publisher

ASM International

ISBN

9780871706591, 0871706598

Peer reviewed