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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

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