Ultrafine particles emitted by flame and electric arc guns for thermal spraying of metals.
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.
Bémer
Denis
D
Institut National de Recherches et Sécurité, Vandoeuvre, France. denis.bemer@inrs.fr
Régnier
Roland
R
Subra
Isabelle
I
Sutter
Benjamin
B
Lecler
Marie T
MT
Morele
Yves
Y
D000336:Aerosols / Q000032:analysis; D000395:Air Pollutants, Occupational / Q000032:analysis*; D016902:Air Pollution, Indoor / Q000032:analysis / Q000706:statistics & numerical data; D000497:Alloys / Q000032:analysis; D004784:Environmental Monitoring / Q000295:instrumentation / Q000379:methods; D019544:Equipment Failure Analysis; D005374:Filtration / Q000295:instrumentation; D006358:Hot Temperature; D006801:Humans; D008669:Metallurgy / Q000379:methods; D008670:Metals / Q000032:analysis*; D016273:Occupational Exposure / Q000032:analysis* / Q000517:prevention & control / Q000706:statistics & numerical data; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis*; D012134:Respiratory Protective Devices; D014691:Ventilation / Q000295:instrumentation / Q000379:methods
D000336:Aerosols; D000395:Air Pollutants, Occupational; D000497:Alloys; D008670:Metals; D052638:Particulate Matter