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Design, construction, and validation for in-situ water layer thickness determination during accelerated corrosion testing

Corrosion Science

Katona, Ryan M.; Perry, Jay; Kelly, Robert G.

A sensor to determine water layer (WL) thickness, ranging from 0-5 mm, in salt-spray testing is presented. WL thickness is based on electrical resistivity and sensor design was guided by Finite Element Modeling with validation under known WL thicknesses. WLs were measured in continuous salt spray testing and angle of exposure played the largest role in thicknesses. At angles greater than 20' from vertical, semi-periodic run-off decreased WLs up to 80 %. Finally, exposure angle determines if thin-film conditions are achieved, likely influencing corrosion rate and morphology. Allowances for sample angle in testing standards pose a potentially large source of variability.

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TYPE Journal Article YEAR 2020
DOIOSTI

Use of in situ Raman spectroelectrochemical technique to explore atmospheric corrosion in marine-relevant environments

Electrochemistry Communications

Katona, Ryan M.; Kelly, Robert G.; Bryan, C.R.; Schaller, Rebecca S.; Knight, A.W.

Here, for the first time, we demonstrate the use of an in situ spectroelectrochemical Raman technique to explore simulated atmospheric corrosion scenarios with a variable boundary layer thickness (δ). The effects of solution flow rate on oxygen concentration and δ were explored. It was found solution regeneration is necessary to prevent oxygen depletion in the Raman cell. It was further shown that by increasing the solution flow rate, the effective δ decreases and allows for the investigation of atmospheric corrosion scenarios. Finally, the technique developed was utilized to explore the effect of precipitation on the cathodic behavior of SS304L in dilute MgCl2. During cathodic polarization, evidence supports previous observations that magnesium hydroxide species are kinetically favored over the thermodynamically predicted magnesium carbonate.

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TYPE Journal Article YEAR 2020
DOIOSTI
Results 76–89 of 89
Results 76–89 of 89