International Scholarly Research Notices

Research Article

Morphology Characterisation of Pitting Corrosion on Sensitized Austenitic Stainless Steel by Digital Image Analysis

Table 3

Variation of pit width and depth with increasing exposure period.


Pit geometry	Heat treatment	Parameter (m)	Exposure Period (h)
Pit geometry	Heat treatment	Parameter (m)	48	120	168	216	312

Irregular	I	Width	7.12	14.88	11.73	5.74	—
	I	Depth	33.17	27.19	16.31	27.47	—
	II	Width	7.29	9.52	6.01	7.77	8.15
	II	Depth	11.01	9.80	23.32	15.19	25.26
	III	Width	—	6.65	6.35	7.04	6.96
	III	Depth	—	17.15	27.79	7.15	12.84

Conical	I	Width	4.58	9.01	6.86	4.65	4.72
	I	Depth	21.46	14.59	6.29	11.77	18.60
	II	Width	—	6.51	4.79	4.57	5.02
	II	Depth	—	6.88	16.81	13.02	15.29
	III	Width	—	4.86	5.01	6.30	6.35
	III	Depth	—	20.62	19.60	6.46	8.78

Transition region A	I	Width	4.74	6.89	6.64	4.38	6.34
	I	Depth	14.02	7.34	8.57	14.64	14.31
	II	Width	5.50	6.66	4.39	5.53	6.22
	II	Depth	10.50	6.88	15.00	10.68	12.99
	III	Width	4.37	5.71	4.17	6.06	5.80
	III	Depth	20.15	9.65	13.43	6.18	7.91

Hemispherical	I	Width	4.82	6.02	5.89	3.91	3.67
	I	Depth	11.19	6.85	6.99	8.66	14.02
	II	Width	5.99	5.76	5.07	5.55	6.38
	II	Depth	9.16	6.32	10.13	7.54	10.28
	III	Width	3.24	4.97	5.01	5.54	4.88
	III	Depth	13.09	8.33	9.48	5.59	7.00

Transition region B	I	Width	5.05	5.54	5.16	4.74	4.78
	I	Depth	5.40	5.21	4.73	5.16	5.91
	II	Width	5.65	4.52	6.60	6.36	6.37
	II	Depth	6.30	5.29	7.39	6.51	7.55
	III	Width	4.79	5.10	5.12	3.19	4.72
	III	Depth	5.64	6.01	6.14	5.98	4.91

Cylindrical	I	Width	—	—	—	—	—
	I	Depth	—	—	—	—	—
	II	Width	—	—	—	—	—
	II	Depth	—	—	—	—	—
	III	Width	—	—	—	—	—
	III	Depth	—	—	—	—	—