Gas-flame deposition of corrosion-resistant coatings

Journal Article · Sat Jul 01 04:00:00 EDT 1995 · Metallurgist

OSTI ID:456725

Lakhotkin, Yu V; Kuz`min, V P; Nikolaev, V N

A technology has been developed for the gas-flame deposition of corrosion-resistant coatings. The coatings have a number of potential uses: for regulating valves and stop valves on oil and gas pipelines; for important friction elements subject to abrasive and corrosive wear during service; for hard-alloy cutting plates and tools made of high-speed steel that are used to machine metal, wood, stone, and glass; for dies and die plates used to shape metals. The technology makes is possible to obtain coatings of tungsten carbide on products made of hard alloys, structural and high-speed steels, copper, and nickel. The process is conducted at a temperature of 450-550{degrees}C. Deposition rate is 100-500 {mu}m/h. Coating thickness ranges up to 500 {mu}m. The microhardness of the coating can reach 3500 kg/mm{sup 2} (35 kN/mm{sup 2}), which is 2-3 times greater than the microhardness of hard alloys, titanium nitride, and galvanic chromium. Adhesion approaches 15-20 kg/mm{sup 2}. The coatings are resistant to corrosion in acidic and alkaline media and hydrogen sulfide. The most promising application of the technology is for important friction elements subject to corrosive wear during service. Tests of pipeline valves and bushings in corrosive media showed that service life is increased by a factor between ten and a hundred. The inventors of the method own the rights to this technology in the Russian Federation.

• OSTI ID: 456725
• Journal Information: Metallurgist, Journal Name: Metallurgist Journal Issue: 11-12 Vol. 38; ISSN MTLUA8; ISSN 0026-0894
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ADHESION
COATINGS
CORROSION RESISTANCE
DEPOSITION
MECHANICAL PROPERTIES
MICROHARDNESS
TUNGSTEN CARBIDES
WEAR