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Electrodeposition of Erosion-Resistant Titanium Diboride Coatings.


PB293234

Publication Date 1979
Personal Author Flinn, D. R.; McCawley, F. X.; Smith, G. R.; Needham, P. B.
Page Count 36
Abstract The Bureau of Mines report describes methods to electrodeposit erosion-resistant titanium diboride coatings from molten alkali metal borate baths at 900C. These coatings have been shown to be highly resistant to material loss during impingement with high-velocity alumina and silicon carbide powders, and they show promise as protective coatings to reduce metal loss in erosive chemical environments, such as coal gasification systems. The most erosion-resistant coatings were prepared on nickel, Inconel, and molybdenum from an electrolyte containing LiBO2, NaBO2, Na2TiO3, and TiO2. The best coatings were deposited at current densities of approximately 220 ma/sq cm, using titanium or titanium diboride anodes. Erosion-resistant coatings were shown to exhibit (1) a high degree of crystallographic orientation along the (100) or (110) planes, (2) a chromium impurity level of less than 3 pct, and (3) a uniform, smooth, consolidated surface appearance when viewed under a microscope or by scanning electron microscopy. Optical spectroscopic studies of the molten electrolyte suggest that the lower valent (+3) titanium ion predominates in the baths.
Keywords
  • Abrasion resistant coatings
  • Electrodeposition
  • Titanium boride
  • Erosion resistance
  • Hard surfacing
  • Molten salt electrolytes
  • Protective coatings
  • Salt baths
  • Nickel
  • Inconel
  • Molybdenum
  • Chemical properties
  • Physical properties
  • Nickel alloy Inconel
Source Agency
  • Bureau of Mines
NTIS Subject Category
  • 71E - Coatings, Colorants, & Finishes
Corporate Authors Bureau of Mines, College Park, MD. Avondale Metallurgy Research Center.
Document Type Technical Report
Title Note Rept. for investigations.
NTIS Issue Number 197915
Electrodeposition of Erosion-Resistant Titanium Diboride Coatings.
Electrodeposition of Erosion-Resistant Titanium Diboride Coatings.
PB293234

  • Abrasion resistant coatings
  • Electrodeposition
  • Titanium boride
  • Erosion resistance
  • Hard surfacing
  • Molten salt electrolytes
  • Protective coatings
  • Salt baths
  • Nickel
  • Inconel
  • Molybdenum
  • Chemical properties
  • Physical properties
  • Nickel alloy Inconel
  • Bureau of Mines
  • 71E - Coatings, Colorants, & Finishes
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