scholarly journals Effects of Relative Humidity on Crevice Corrosion Behavior of 304L Stainless-Steel Nuclear Material in a Chloride Environment

Metals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1185 ◽  
Author(s):  
Yeh ◽  
Tsai ◽  
Huang
Keyword(s):  
Stainless Steel ◽  
Relative Humidity ◽  
Corrosion Behavior ◽  
Crevice Corrosion ◽  
Salt Spray ◽  
Coastal Region ◽  
Steel Specimen ◽  
Electron Back Scatter Diffraction ◽  
304L Stainless Steel ◽  
Stainless Steel Specimen

In the dry cask storage of spent nuclear fuels, a stainless-steel canister acts as an important barrier for encapsulating spent fuels. As a result, local corrosion behavior of 304L stainless steel has become an issue of concern in the wet coastal region and salt spray environment. The test was conducted after deposition of simulated sea salt particles on the 304L stainless-steel specimen. It was first covered with a crevice former, and then kept at 45 °C with a relative humidity of 45%, 55%, and 70%, respectively. The surface morphologies and electron back scatter diffraction (EBSD) analysis of the corroded region for the 304L stainless-steel specimen are presented in this paper. The goal of this work was to investigate the crevice corrosion behavior of 304L stainless steel under different chloride concentrations and relative humidity conditions. From the experimental results, a threshold relative humidity for stress corrosion cracking (SCC) initiation of 304L stainless steel was proposed.

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

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6834
Author(s):  
Chun-Ping Yeh ◽  
Kun-Chao Tsai ◽  
Jiunn-Yuan Huang
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Relative Humidity ◽  
Crevice Corrosion ◽  
Chloride Concentration ◽  
Electron Back Scatter Diffraction ◽  
304L Stainless Steel ◽  
Aisi 304L ◽  
Crack Morphology ◽  
Aisi 304L Stainless Steel

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.

scholarly journals Influence of Chloride Concentration on Stress Corrosion Cracking and Crevice Corrosion of Austenitic Stainless Steel in Saline Environments

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5640
Author(s):  
Chun-Ping Yeh ◽  
Kun-Chao Tsai ◽  
Jiunn-Yuan Huang
Keyword(s):  
Stainless Steel ◽  
Relative Humidity ◽  
Crevice Corrosion ◽  
Sea Water ◽  
Safety Concern ◽  
Chloride Concentration ◽  
Test Duration ◽  
304L Stainless Steel ◽  
Spent Fuel ◽  
Saline Environments

Stainless steels are used as canister materials for interim storage of spent fuel. Crevice corrosion has proved to be a safety concern of 304L stainless steel spent fuel canisters, when exposed to the saline environments of coastal sites. To study the effects of chloride concentration and test duration on the crevice corrosion behavior, and the effect of relative humidity on the initiation of discrete SCC cracks, a test program was conducted on the 304L steel specimens sprayed with synthetic sea water of 3.5 wt.%. The salt-deposited specimens, wrapped up with a crevice former to form a crevice configuration, were then exposed to an environment at 45 °C with a pre-set 45%, 55%, and 70% relative humidity (RH), for 400 h and 10,000 h, respectively. The surface features and crack morphology of the tested 304L stainless-steel specimens were examined by energy-dispersive spectrometry (EDS) and electron back scatter diffraction (EBSD). For the specimens deposited with a chloride concentration of 1 g/m2, no cracks were found in the corroded regions after 400-h exposure, whereas SCC cracks were observed with the specimens tested for 10,000 h at all three pre-set relative humidity. The specimens tested at the pre-set relative humidity 45% are characterized with discrete SCC cracks, but, on the other hand, those exposed to the environments of 55% and 70% relative humidity show SCC cracks of distinct features. From the results of 10,000-h tests, it is inferred that the chloride concentration threshold for SCC initiation of 304L stainless steel at 45 °C is between 0.1 g/m2 and 1 g/m2.

Effect of texture on corrosion behavior of AISI 304L stainless steel

2005 ◽  
Vol 54 (2) ◽  
pp. 141-147 ◽  
Author(s):  
B. Ravi Kumar ◽  
Raghuvir Singh ◽  
Bhupeshwar Mahato ◽  
P.K. De ◽  
N.R. Bandyopadhyay ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Behavior ◽  
304L Stainless Steel ◽  
Aisi 304L ◽  
Aisi 304L Stainless Steel

scholarly journals Effect of Rare Earth Oxides on Microstructure and Corrosion Behavior of Laser-Cladding Coating on 316L Stainless Steel

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 636 ◽  
Author(s):  
Xu ◽  
Wang ◽  
Chen ◽  
Qiao ◽  
Zhang ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Rare Earth ◽  
Corrosion Behavior ◽  
Laser Cladding ◽  
316L Stainless Steel ◽  
Electrochemical Impedance ◽  
Salt Spray ◽  
Rare Earth Oxides ◽  
X Ray Diffraction ◽  
X Ray

The effect of rare earth oxides on the microstructure and corrosion behavior of laser-cladding coating on 316L stainless steel was investigated using hardness measurements, a polarization curve, electrochemical impedance spectroscopy (EIS), a salt spray test, X-ray diffraction, optical microscopy, and scanning electron microscopy (SEM). The results showed that the modification of rare earth oxides on the laser-cladding layer caused minor changes to its composition but refined the grains, leading to an increase in hardness. Electrochemical and salt spray studies indicated that the corrosion resistance of the 316L stainless steel could be improved by laser cladding, especially when rare earth oxides (i.e., CeO2 and La2O3) were added as a modifier.

scholarly journals The effect of MnS inclusions on the crevice corrosion behavior of 18-8 stainless steel.

1985 ◽  
Vol 36 (7) ◽  
pp. 265-271 ◽  
Author(s):  
Kikuo TAKIZAWA ◽  
Yasuhiko SHIMIZU ◽  
Yoshihiro HIGUCHI ◽  
Imao TAMURA
Keyword(s):  
Stainless Steel ◽  
Corrosion Behavior ◽  
Crevice Corrosion
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