Pitting Kinetics of 304 Stainless Steel Using ESPI Detection Technique

doi:10.1007/s40195-015-0213-0

Abstract

Abstract:

The electronic speckle pattern interferometer was used to in situ monitor the pitting corrosion of 304 stainless steel at anodic polarization. The pitting current and pitting current density of a single pit were obtained. The pit growth was controlled by the corrosion products diffusion. The pit morphology was observed by a scanning electron microscope. The results showed that the pit was dish shaped, and the geometric parameters and pit growth time conformed to the function of Y = A + B₁t + B₂t² + B₃t³.

Key words: Stainless steel, Corrosion, Electronic speckle pattern interferometry (ESPI), Pitting

Wen-Ming Tian, Ying-Jun Ai, Song-Mei Li, Nan Du, Chao Ye. Pitting Kinetics of 304 Stainless Steel Using ESPI Detection Technique[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(4): 430-437.

Figures/Tables 12

Fig. 1 Schematic diagram of the corrosion products causing bright speckles in 3.5 wt% NaCl solution

Fig. 2 Schematic diagram of the ESPI test system

Fig. 3 Current-time curve of 304 stainless steel at 0.35 V (SCE) polarization in 3.5 wt% NaCl solution, pits a-h indicate the occurrence time of speckles A-H (as shown in the following Fig. 4) and the corresponding current

Fig. 4 ESPI images collected at different time when speckles occurred: a 14 s; b 27 s; c 41 s; d 45 s; e 52 s; f 72 s; g 90 s; h102 s

Table 1 Occurrence time of speckles A-H and the corresponding current

Speckle	t (s)	I (μA)
A	14	1.65
B	27	31.1
C	41	245
D	45	278
E	52	176
F	72	601
G	90	1,660
H	102	2,610

Fig. 5 Calculated pitting current of a single pit at 0.35 V (SCE) polarization in 3.5 wt% NaCl solution

Fig. 6 SEM images of pits Ap a, Bp b, Cp c, Dp d, Ep e, Fp f, Gp g, Hp h, which correspond to the speckles A-H in Fig. 4

Fig. 7 Geometric parameters of pits with different growth time: a length and width of pit mouth; b area of pit mouth

Table 2 Values of A, B 1, B 2, and B 3 in Eq. (11) for different geometric parameters of pit mouth length (L), pit mouth width (W) and pit mouth area (S), respectively

Parameter	A	B ₁	B ₂	B ₃
L	-62.4107	5.0348	-0.0262	1.0770E-4
W	-100.5224	8.7260	-0.1250	6.1841E-4
S	-7504.9705	536.9803	-6.8602	0.0752

Fig. 8 Calculated growth rate of a pit mouth at different time: a growth rate of pit mouth length and width; b growth rate of pit mouth area

Fig. 9 Calculated pitting current density of a single stable pit at 0.35 V (SCE) polarization in 3.5 wt% NaCl solution

Fig. 10 SEM image of pit mouth lace cover at 0.35 V (SCE) polarization in 3.5 wt% NaCl solution

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