Corrosion of mild steel exposed to inhibited urea--ammonium nitrate solution at ambient temperature under static conditions

Conference · Tue Dec 31 04:00:00 EST 1991

OSTI ID:10107732

Nguyen, D T; Nichols, D E; Boles, J L ^[1]; Lohry, E J ^[2]

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1. National Fertilizer and Environmental Research Center, Muscle Shoals, AL (United States)
2. Nutra-Flo Co., Sioux City, IA (United States)

A series of corrosion tests was performed with mild steel exposed to 32-0-0 UAN solution at ambient temperature, under static conditions, and at pHs of 6.8 to 7.2 to evaluate the effectiveness of several new corrosion inhibitors. Results of the tests revealed that the pH of 32-0-0 UAN in the neutral range does not significantly affect the corrosion rate of mild steel after prolonged exposure. The corrosion rate of mild steel was 60 to 70 mpy. Results of tests with inhibitors showed that 100 ppm of Surtech 143 from Surface Chemists of Florida, Inc., provided excellent corrosion resistance (approximately 1 mpy after long-term exposure). With a 5-minute surface treatment, Rust Resistor from Nutra-Flo Co., provided excellent corrosion resistance (corrosion rates less than 1 mpy). Corblok at 100 ppM provided excellent corrosion resistance up to 14 days (corrosion rate of approximately 2 mpy); the corrosion rate increased slightly when exposed for 28 days. Surtech 145 and Surtech 433 provided only limited protection.

• Research Organization: National Fertilizer and Environmental Research Center, Muscle Shoals, AL (United States)
• Sponsoring Organization: Tennessee Valley Authority, Knoxville, TN (United States)
• OSTI ID: 10107732
• Report Number(s): TVA-Bull--Z-299; CONF-910812--19; ON: DE93002455
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105
553000
60 APPLIED LIFE SCIENCES
AGRICULTURE AND FOOD TECHNOLOGY
AMMONIUM NITRATES
AQUEOUS SOLUTIONS
CORROSION
CORROSION AND EROSION
CORROSION INHIBITORS
CORROSIVE EFFECTS
STEELS
TEMPERATURE RANGE 0273-0400 K
TESTING
UREA