Journal
ANNALS OF OCCUPATIONAL HYGIENE
Volume 54, Issue 6, Pages 607-614Publisher
OXFORD UNIV PRESS
DOI: 10.1093/annhyg/meq052
Keywords
cabin; filtration; thermal spraying; ultrafine particles
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The ultrafine aerosol emitted by thermal spraying of metals using flame and electric arc processes has been characterized in terms of particle size distribution and emission rates based on both particle number and mass. Thermal spraying of Zn, Zn/Al, and Al was studied. Measurements taken using an electrical low pressure impactor and a condensation nucleus counter reveal an aerosol made up of very fine particles (80-95% of number distribution < 100 nm). Ultrafine particle emission rates produced by the electric arc process are very high, the largest values being recorded during spraying of pure aluminium. This process generates high particle emissions and therefore requires careful consideration and possible rethinking of currently implemented protection measures: ventilated cabins, dust collectors, and personal protective equipment.
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