Crevice Corrosion of Several Supper Stainless Steels in the Simulated LT-MED Environment

doi:10.1007/s40195-018-0728-2

Abstract

Abstract:

Susceptibility and morphological characteristics of crevice corrosion for SS316, SS904L, SS254sMo and SS2507 in the simulated low-temperature multi-effect distillation environment were investigated by cyclic polarization test, scanning electron microscope and laser microscope. The results show that the crevice corrosion resistance of four kinds of stainless steel is ranked as SS254sMo?≈?SS2507?>?SS316?>?SS904L. There are “cover” structures over the edge of active crevice corrosion regions of SS904L, SS254sMo and SS2507, but SS316 is an exception. Galvanic corrosion characteristics appeared in the crevice of duplex supper stainless steel SS2507.

Key words: Supper austenite stainless steel, Super duplex stainless steel, Low-temperature multi-effect distillation (LT-MED), Crevice corrosion, “Cover”, structure

Chang-Gang Wang, Xiao-Fang Li, Jie Wei, Xin Wei, Fang Xue, Rong-Yao Ma, Jun-Hua Dong, Wei Ke. Crevice Corrosion of Several Supper Stainless Steels in the Simulated LT-MED Environment[J]. Acta Metallurgica Sinica (English Letters), 2018, 31(11): 1137-1147.

Figures/Tables 15

Table 1 Chemical compositions of SS316, SS904L, SS254sMo and SS2507 stainless steels (wt%)

	C	Cr	Ni	Mn	Si	P	S	Mo	N	Cu
SS316	0.05	16.9	10.6	1.6	0.5	0.031	0.006	2.05	-	-
SS904L	0.02	20.1	25.3	2.00	1.00	0.045	0.035	4.04	-	1.32
SS254sMo	0.02	19.7	17.8	1.0	0.8	0.03	0.01	6.2	0.19	0.75
SS2507	0.03	25.4	7.01	1.00	0.80	0.035	0.020	4.2	0.27	0.50

Fig. 1 Metallographic morphologies of a SS316, b SS904L, c SS254sMo, d SS2507 stainless steels

Fig. 2 Multiple crevice assembly with the specimen [13, 14]: a dimensions of crevice former; b dimensions of test specimen; c specimen assembly

Table 2 Compositions of the two times concentrated artificial seawater (g/L)

NaCl	MgCl₂	Na₂SO₄	CaCl₂	NaHCO₃	KBr	H₃BO₃
49.06	10.4	8.18	2.32	0.402	0.202	0.054

Fig. 3 Schematic diagram of the three-electrode test cell

Fig. 4 Cyclic potentiodynamic polarization curves of a SS316, b SS904L, c SS254sMo, d SS2507 stainless steel crevice corrosion specimen in two times concentrated artificial seawater at 70 °C

Table 3 Parameter values of cyclic polarization curves of SS316, SS904L, SS254sMo and SS2507 stainless steels (mVSCE)

	E _corr	E _b	E _rp
SS316	-?325	86	-?373
SS904L	-?307	114	-?242
SS254sMo	-?231	175	-?189
SS2507	-?213	178	-?165

Fig. 5 Macromorphology of SS904L artificial crevice corrosion specimen a and picture of crevice depth measurement b

Fig. 6 Statistical diagram of the number of crevice sites attacked by crevice corrosion on four kinds of stainless steel after cyclic polarization testing

Fig. 7 diagram of the maximum depth of each crevice corrosion sites on four kinds of stainless steel

Fig. 8 Sketch map of depth distribution of crevice corrosion [17]

Fig. 9 SEM micrographs of different regions on a typical crevice corrosion site of SS316 after cyclic polarization testing

Fig. 10 SEM micrographs of different regions on a typical crevice corrosion site of SS904L after cyclic polarization testing

Fig. 11 SEM micrographs of different regions on a typical crevice corrosion site of SS254sMo after cyclic polarization testing

Fig. 12 SEM micrographs of different regions on a typical crevice corrosion site of SS2507 after cyclic polarization testing

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