Electrochemical Behavior, Microstructure, and Surface Chemistry of Thermal-Sprayed Stainless-Steel Coatings

Nascimento, Alexandre Romão Costa; Gateman, Samantha Michelle; Mauzeroll, Janine; Savoie, S.; Schulz, Robert; Moreau, Christian

doi:10.3390/coatings9120835

Cited by 2 publications

(3 citation statements)

References 36 publications

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“…Nevertheless, the bulk stainless steel performs significantly better than the coatings (E Corr = +88 mV ± 2 mV). These results are as well reported and discussed in detail for AISI 316L HVOF and HVAF coatings in [15,17,30,31].…”

Section: Poteniodynamic Polarization Test Results In 35% Nacl Solutionsupporting

confidence: 82%

“…The salt spray test or the Corrodkote test are specifically designed to induce sub-corrosion in order to test the apparent density of the coatings. In research, studies often deal with electrochemicalinstrumented tests such as potentiodynamic polarization, electrochemical impedance, and immersion tests in 3.4% to 5% sodium chloride (NaCl) solutions [14][15][16][17]. For these corrosion tests, the following observations can be summarized: the open circuit potential (OCP) and the corrosion potential (E Corr ), respectively, decreases with immersion time due to electrolyte infiltration of the coating toward the substrate.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, thermal spray coatings with a homogeneous and compact coating microstructure with less oxidation are preferred for corrosive application. In order to improve the corrosion behavior, several authors studied the influence of the spray parameters [15][16][17][18][19][20][21] or post treatments like sealing [22][23][24] or heat treatments [18,25,26]. Post treatments are cost and time consuming and can alter the substrate.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Aqueous and Gelled 3.5% NaCl Electrolytes for Assessing the Corrosion Resistance of Thermal Spray Stainless-Steel Coatings in Electrochemical Corrosion Tests

et al. 2022

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Corrosion testing with gel electrolytes gained attention in the past decade due to the advantage of almost non-destructive and in situ electrochemical measurements of bulk materials. Regarding thermal spray coatings, gel electrolytes offered the opportunity to prevent the infiltration of the typical microstructural features such as pores and microcracks. Using the example of stainless-steel AISI 316L coatings deposited by high velocity air fuel (HVAF) spraying on mild and stainless-steel substrates, the electrochemical corrosion behavior was analyzed in 3.5% NaCl electrolytes in an aqueous and gelled state. In this context, potentiodynamic polarization tests were carried out in a three-electrode corrosion cell, which was adapted for gel electrolyte testing. Gelling was realized with a technical gelatin. The characteristic corrosion values, such as open circuit potential, corrosion potential, and corrosion current density, revealed for the gelled state that the influence of the substrate material used could be eliminated and thus, the coatings itself could be characterized. In contrast, the coating specific microstructure and substrate material significantly affected the potentiodynamic polarization curve in the 3.5% NaCl aqueous electrolyte. Optical microscopy of the coating surfaces and cross-sections proved that the corrosion attack caused by aqueous electrolytes could be mimicked with the gel electrolyte.

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Section: Poteniodynamic Polarization Test Results In 35% Nacl Solutionsupporting

confidence: 82%