Investigation of Susceptibility to Intergranular Corrosion of Tin-Added Austenitic Stainless Steel

doi:10.1007/s40195-015-0311-z

Abstract

Abstract:

The intergranular corrosion (IGC) character of tin-added B316LX and the influence of tin addition on IGC susceptibility were investigated by DL-EPR, oxalic acid etch test and transmission electron microscopy. IGC susceptibility of B316LX is mainly caused by the precipitation of M ₂₃C₆ carbide and intermetallic Laves phase. DL-EPR test is unsuitable to evaluate the IGC susceptibility of B316LX with long-time sensitization, because more carbides and intermetallic phases are formed at grain boundaries and inside the grains, which induce more severe IGC and pits attacks. Tin addition increases the IGC susceptibility, maybe due to diffusion of tin toward grain boundaries.

Key words: Stainless steel, Tin, SEM, TEM, Intergranular, corrosion

Min Sun, Yuan-Yuan Yang, Ming Luo, Lai-Zhu Jiang, Yi-Ming Jiang, Jin Li. Investigation of Susceptibility to Intergranular Corrosion of Tin-Added Austenitic Stainless Steel[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(9): 1183-1189.

Figures/Tables 8

Fig. 1 DL-EPR curves for B316LX after solution and sensitization heat treatment at different temperatures for various time: a 600 °C; b 650 °C; c 700 °C; d 750 °C; e 800 °C.

Table 1 R a values calculated from EPR curves for B316LX ASS

Temperature (°C)	Time (h)
Temperature (°C)	0.5	1	5	10	24	100
600	-	1.82	1.46	4.86	0.26	0.06
650	-	5.11	8.45	-
700	5.65	9.06	18.77	-	1.39	0.48
750	4.85	10.18	20.18	12.82
800	-	-	3.48	-	0.61	0.02

Fig. 2 Morphologies of B316LX with short-time-sensitizing treatment at different temperatures for various time after oxalic acid etch: a 600 °C, 10 h; b 650 °C, 5 h; c 700 °C, 1 h; d 700 °C, 5 h; e 750 °C, 0.5 h; f 750 °C, 1 h; g 750 °C, 5 h; h 800 °C, 5 h.

Fig. 3 Morphologies of B316LX with long-time-sensitizing treatment at different temperatures for 100 h and etching by oxalic acid: a 600 °C; b; 700 °C; c 800 °C.

Fig. 4 TTS curves of tin-added ASS derived from 10% oxalic acid etch test.

Fig. 5 TEM micrograph and electron diffraction pattern of M 23C6 intergranular precipitates in B316LX ASS sensitized at 750 °C for 10 h [19].

Fig. 6 TEM micrograph and electron diffraction pattern of precipitation in B316LX ASS sensitized at 750 °C for 100 h.

Fig. 7 TTS curves of B316LX and 316L steels derived from 10% oxalic acid etch test.

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