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. 2021 Nov 12;14(22):6834.
doi: 10.3390/ma14226834.

The Effect of Deposited Dust on SCC and Crevice Corrosion of AISI 304L Stainless Steel in Saline Environment

Chun-Ping Yeh  1 , Kun-Chao Tsai  1 , Jiunn-Yuan Huang  1
Affiliations

The Effect of Deposited Dust on SCC and Crevice Corrosion of AISI 304L Stainless Steel in Saline Environment

Chun-Ping Yeh et al. Materials (Basel). .

Abstract

Crevice corrosion has become an important issue of the safety of AISI 304L austenitic stainless steel canister when exposed to the chloride environments located in coastal areas. Moreover, dust deposited on the canister surface may enhance the corrosion effect of 304L stainless steel. In this work, white emery was adopted to simulate the dust accumulated on the as-machined specimen surface. To investigate the effect of deposited white emery, chloride concentration, and relative humidity on the crevice corrosion behavior, an experiment was conducted on 304L stainless steel specimens at 45 °C with 45%, 55%, and 70% relative humidity (RH) for 7000 h. The surface features and crack morphology of the tested 304L stainless steel specimens were examined by SEM equipped with energy-dispersive spectrometry (EDS) and electron back scatter diffraction (EBSD). From the experimental results, a threshold RH for the stress corrosion cracking (SCC) initiation of AISI 304L austenitic stainless steel with different concentrations of chloride was proposed.

Keywords: chloride concentration; crevice corrosion; dust; relative humidity; stainless steel; stress corrosion cracking.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Dimensions of the specimen used for crevice corrosion test.
Figure 2
Figure 2
Schematic diagram of the specimen sprayed with synthetic sea water and white emery.
Figure 3
Figure 3
Macrographs of the specimens with a 1 g/m2 chloride concentration after 7000 h of testing a relative humidity (RH) of 70%.
Figure 4
Figure 4
Macrographs of the corrosion regions of those samples with a chloride concentration of 1 g/m2 at RH = 70%: (a) Specimen before cleaning and (b) specimen after cleaning.
Figure 5
Figure 5
Macrographs of the corrosion regions of those samples with a 0.1 g/m2 chloride concentration at: (a) Relative humidity = 45%, (b) relative humidity = 55%, and (c) relative humidity = 70%.
Figure 6
Figure 6
SEM micrographs of those specimens with a 0.1 g/m2 chloride concentration at: (a) Relative humidity = 45%, (b) relative humidity = 55%, and (c) relative humidity = 70%.
Figure 7
Figure 7
Macrographs of the corroded regions of those samples with a 1 g/m2 chloride concentration at: (a) Relative humidity = 45%, (b) relative humidity = 55%, and (c) relative humidity = 70%.
Figure 8
Figure 8
SEM micrographs of those samples with a chloride concentration of 1 g/m2 after 7000 h of testing at: (a) RH = 45%, (b) RH = 55%, and (c) RH = 70%.
Figure 9
Figure 9
Energy dispersive X-ray spectrometry (EDS) analysis of the corroded regions on those specimens with a 1 g/m2 chloride deposit after testing at 55% relative humidity for 7000 h.
Figure 10
Figure 10
SEM morphology of the SCC in those samples with 0.1 g/m2 of chloride deposited after 7000 h of testing at RH = 70%.
Figure 11
Figure 11
SEM morphology of the SCC in those samples with a chloride concentration of 1 g/m2 after 7000 h of testing at: (a) RH = 55% and (b) RH = 70%.
Figure 12
Figure 12
EDS mapping for the crack regions of those samples with a chloride concentration of 1 g/m2 tested for 7000 h at a relative humidity of 70%: (a) Band contrast image, (b) Fe mapping, (c) Mn mapping, (d) S mapping, (e) Cl mapping, and (f) O mapping.
Figure 13
Figure 13
Electron back scatter diffraction (EBSD) maps for the crack region of the specimens deposited with a 1 g/m2 chloride concentration tested for 7000 h at 70% RH: (a) Euler map, (b) strain countering map, (c) kernel average misorientation (KAM) map, and (d) inverse pole figure (IPF) map.
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