SYMPOSIA PAPER Published: 01 January 1996

Vitrification of Lead Contained in Lead Based Organic Coatings Using Thermal Spray Technology


The feasibility of in situ vitrification of lead oxide contained in red lead based organic coatings was investigated. The removal of organic lead based primers and paints has been achieved by a flame spray process that uses a glass/ceramic compound designed for high lead solubility and resistance to devitrification. The two designer glass waste forms that exhibited the best results belong to the lead borosilicate and the lead alkali silicate systems. The glass/ceramic compounds were prepared by fusing, fritting, and ball milling to produce the desired powder. The resulting powder was collected and used to flame spray previously prepared samples containing a commonly used red lead primer. Oxyacetylene flame spray technology was used to apply the glass compound to the steel substrate. The resulting glass waste was collected and analyzed for lead content using X-Ray Spectrometry (XRS) and the lead cation teachability rates using the U.S. Environmental Agency approved Toxicity Characteristic Leaching Procedure (TCLP). Of the alkali silicate glass compositions that were tested, the least lead leached from the glass was 2 ppm of lead. The lowest leachate concentration from the borosilicate glass compositions was 12 ppm of lead.

Author Information

Covey, SW
USACERL, Champaign, IL
Petreanu, JP
USACERL, Champaign, IL
Kumar, A
USACERL, Champaign, IL
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Developed by Committee: D34
Pages: 311–326
DOI: 10.1520/STP14122S
ISBN-EB: 978-0-8031-5318-9
ISBN-13: 978-0-8031-1443-2