Table 2.

Experimental considerations, materials, and average degradation rate of W, Ni_0,8Cr_0,2 and stainless steel.

Material	D (µm)	Number assays	$\mathrm{\Delta }$ V (kV)	Exposure time, tf (h)	Corona power reduction (%)	Final state	Final current, I (µA/cm)	Qf (C/cm)	ea (µg/C)
Stainless steel 302	50	12	4.75	50	72.7	Rupture	15	4	29
Ni0.8Cr0.2	50	8	4.75	95	48	Rupture	32.5	11.1	7.6
Tungsten	50	18	4.5–4.75	1630	56.5	Stopped	50	300.42	0.92
	25	8	4–4.3	450	40.3	Stopped	27.5	44.5	3.7
	100	10	4.9–5.2	600	65.2	Stopped	40	86.4	5.3