Corrosion behavior of molybdenum plasma-spray coatings on steel

Journal Article · Fri Oct 15 04:00:00 EDT 1993 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(93)90189-Y· OSTI ID:5987611

Koutsomichalis, A; Badekas, H ^[1]

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1. National Technical Univ. of Athens, (Greece). Lab. of Physical Metallurgy

Plasma spraying is a versatile technique for applying protective coatings to engineering alloys. Plasma-sprayed coatings are often used for thermal oxidation, corrosion and wear protection of various substrates. Theses coatings are frequently exposed in corrosive environments even when their major purpose is not to provide corrosion protection. Plasma-sprayed coatings exhibit a degree of porosity because the molten droplets deposited by the plasma-spray process, cool very rapidly and cannot completely wet the substrate surface. This residual porosity affects the corrosion behavior of plasma-sprayed coatings because corrosive fluids can penetrate the coating and dissolve the substrate material. Furthermore, galvanic effects between the coating and the substrate must be taken into account. Among the several plasma-sprayed metallic coatings used today are the molybdenum coatings; these coatings have excellent wear resistance, particularly in erosion-cavitation wear, but are sensitive in air oxidation at temperatures exceeding 650 C. The main purpose of the present work was to examine the morphology, composition, and corrosion behavior of molybdenum plasma-sprayed coatings on mild steel specimens.

• OSTI ID: 5987611
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 29:8; ISSN SCRMEX; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
CHEMICAL REACTIONS
COATINGS
CORROSION
CORROSION RESISTANCE
DEPOSITION
ELEMENTS
IRON ALLOYS
IRON BASE ALLOYS
METALS
MOLYBDENUM
PLASMA ARC SPRAYING
PROTECTIVE COATINGS
SPRAY COATING
SPRAYED COATINGS
STEELS
SURFACE COATING
TRANSITION ELEMENTS