Table 6.

Distribution statistics of pitting size of L2.

Specimen Name	Area Interval (/mm2)	Number of Pits
		30-day	60-day	90-day
L2	0~0.015	32	145	315
	0.015~0.03	3	17	121
	0.03~0.045	0	4	7
	0.045~0.06	0	0	0
	Total	35	166	443