Particle Emissions from Chrome Plating

Figures & data

FIG. 1 Formation of aerosol particles from bursting of gas bubble.

FIG. 2 Gas volume measurement apparatus.

FIG. 3 Aerosol emission measurement apparatus.

FIG. 4 Cathode H₂ and Anode O₂ volumes versus process current.

FIG. 5 Aerosol emissions versus process current.

FIG. 6 Aerosol emissions versus volume of gases evolved.

FIG. 7 Size distribution of particles emitted from cathode.

FIG. 8 Size distribution of particles emitted from anode.

FIG. 9 Amount of Cr⁺⁶ in aerosol particle samples.

TABLE 1 Chrome plating emission factors

	Anode	Cathode	Total
	(mg/amp-hr)	(mg/amp-hr)	(mg/amp-hr)
This study
Total Particulate	0.15	5.00	5.15
Hexavalent Chrome	0.11	3.70	3.81
Sogabe (1991)
Total Particulate			7.82
Total Chrome			2.89
Total Hexavalent Chrome			4.28
EPA (1989)
Hard Chrome Plating (total chrome)			9.8
Decorative Chrome Plating (total chrome)		1.6

FIG. 10 Size distribution of particles emitted from chrome plating processes.

FIG. 11 ΔM/ΔlogD graph of chrome plating particle emissions size distribution.

Sogabe , M. N. 1991 . Characterization of Airborne Chromium Emissions from Hard Chromium Plating Tanks , Master of Science in Civil Engineering Thesis Department of Civil Engineering, University of Washington .

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USEPA . 1989 . Locating and Estimating Air Emissions From Sources of Chromium (Supplement). Research Triangle Park, NC, August 1989[CSA]

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