Electrochemical Evaluation of Protective Coatings with Ti Additions on Mild Steel Substrate with Potential Application for PEM Fuel Cells

Avram, Diana Nicoleta; Davidescu, Corneliu Mircea; Dan, Mircea Laurențiu; Rosca, Julia Claudia Mirza; Hulka, Iosif; Pascu, Alexandru; Stanciu, Elena Manuela

doi:10.3390/ma15155364

Cited by 8 publications

(6 citation statements)

References 31 publications

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“…The equipment used for powder deposition and the deposition parameters were as presented in our previous study [26]. In summary, a diode laser with λ = 975 nm (Coherent F1000) mounted on a robotic arm (Cloos 6-axes) was used for laser cladding of feedstock powders fed from a processing head (Precitec WC 50) onto the AISI 1010 substrate.…”

Section: Materials and Deposition Processmentioning

confidence: 99%

“…After the samples were subjected to potentiostatic polarization, the EIS measurements and potentiodynamic polarization were repeated. EIS measurements were employed with the impedance module of SP150, as described in our previous paper [26], in the frequency range of 10 −1 -10 5 Hz with a 10 mV AC voltage amplitude. A ZView 3.4 software (Scribner Associates, Inc., Southern Pines, NC, USA) was used to fit all of the experimental EIS data to their corresponding equivalent electrical circuit (EEC).…”

Section: Characterization Of Protective Coatingsmentioning

confidence: 99%

“…In our previous studies [26,27], we successfully laser cladded NiCr(Ti)-based coatings onto low carbon steel plates and electrochemically tested them in a very acidic PEMFC environment (aggressive conditions). The NiCr-based superalloy was selected as the base material due to its good corrosion resistance [28], while titanium was added as a reinforcing material into the composition (up to 10 wt% Ti addition).…”

Section: Introductionmentioning

confidence: 99%

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Corrosion Behavior of Coated Low Carbon Steel in a Simulated PEMFC Environment

et al. 2023

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Here, potential metallic bipolar plate (BP) materials were manufactured by laser coating NiCr-based alloys with different Ti additions on low carbon steel substrates. The titanium content within the coating varied between 1.5 and 12.5 wt%. Our present study focussed on electrochemically testing the laser cladded samples in a milder solution. The electrolyte used for all of the electrochemical tests consisted of a 0.1 M Na2SO4 solution (acidulated with H2SO4 at pH = 5) with the addition of 0.1 ppm F−. The corrosion resistance properties of the laser-cladded samples was evaluated using an electrochemical protocol, which consisted of the open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) measurements, and potentiodynamic polarization, followed by potentiostatic polarization under simulated proton exchange membrane fuel cell (PEMFC) anodic and cathodic environments for 6 h each. After the samples were subjected to potentiostatic polarization, the EIS measurements and potentiodynamic polarization were repeated. The microstructure and chemical composition of the laser cladded samples were investigated by scanning electron microscopy (SEM) combined with energy-dispersive X-ray spectroscopy (EDX) analysis.

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Section: Materials and Deposition Processmentioning

confidence: 99%

Section: Characterization Of Protective Coatingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Corrosion Behavior of Coated Low Carbon Steel in a Simulated PEMFC Environment

et al. 2023

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“…In our latest investigations, we have presented that laser cladding technology might be used as a manufacturing option to produce protective coatings on mild steel substrate with potential application for metallic bipolar plates [12], [13].…”

Section: Introductionmentioning

confidence: 99%

Influence of Titanium Additions on The Electrochemical Behaviour of NiCr/Ti Laser Cladded Coatings

Avram¹,

Davidescu²,

Dan³

et al. 2022

AWET

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In this research, the electrochemical evaluation of NiCr/Ti laser cladded coatings in simulated polymer electrolyte membrane fuel cells (PEMFCs) environment was investigated. The Laser Cladding technique was used to develop protective coatings on mild steel substrate using NiCr-based powders mixed with 12.5, 15, 17.5 and 20 wt.% Ti additions. The samples were tested at room temperature in Na2SO4 0.1M + 0.1 ppm F-. The potentiodynamic polarization curves are presented before and after the samples were subjected to accelerated stress tests, for 6 hours each, at +0.736 V (cathodic environment) and at -0.493 V (anodic environment). Afterwards, scanning electron microscopy (SEM) was used to investigate the effect of Ti addition in terms of morphology. Energy-dispersive X-ray spectroscopy (EDS) was performed for chemical evaluation of the surface after corrosion tests.

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“…It was found that the corrosion rate of the coating can be reduced more than two-fold when the optimal processing condition is applied. The research presented in [ 12 ] evaluates properties of NiCr(Ti) protective coatings on mild steel plates prepared by diode laser cladding technology. The NiCr coatings with different Ti additions are intended to be used as potential materials for bipolar plates in polymer electrolyte membrane fuel cells.…”

mentioning

confidence: 99%