Corrosion Resistance and Electrical Conductivity of TiN/CrN Multilayer Coated Stainless Steel

2011 ◽  
Vol 214 ◽  
pp. 291-295
Author(s):  
Wei Yu Ho ◽  
Chung Hsien Yang ◽  
Wei Che Huang ◽  
Woei Yun Ho
Keyword(s):  
Electrical Conductivity ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Steel Substrate ◽  
Bipolar Plate ◽  
Layered Coatings ◽  
Cathodic Arc Deposition ◽  
Metallic Bipolar Plate ◽  
Cell Test ◽  
Steel Substrates

In this study, various multilayered TiN/CrN coatings were deposited on the SS316L stainless steel substrates by the cathodic arc deposition technique. By varying the turntable rotation speed, the multilayered coatings with different periodic layer thickness were obtained. The main target of this study is to enhance the corrosion resistance and electrical conductivity of the stainless steel for potential application of metallic bipolar plate of PEMFC. The results showed that all of the TiN/CrN coated samples presented a better corrosion resistance than the bare stainless steel substrate. The multi-layered coatings deposited at the 2 rpm provided the best corrosion resistance of the coated stainless steels when they were subjected to polarization test in 1M H2SO4 solution. The result of single fuel cell test shows that the TiN/CrN multi-layered coating with the best corrosion resistance is considered to be a candidate for PEMFC bipolar plate application in this study.

scholarly journals Fabrication and Characterization of Zein/Hydroxyapatite Composite Coatings for Biomedical Applications

Surfaces ◽  
2020 ◽  
Vol 3 (2) ◽  
pp. 237-250 ◽  
Author(s):  
Yusra Ahmed ◽  
Muhammad Yasir ◽  
Muhammad Atiq Ur Rehman
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Biomedical Applications ◽  
Steel Substrate ◽  
Composite Coatings ◽  
Sem Images ◽  
Taguchi Design Of Experiments ◽  
Hydrophilic Nature ◽  
Strong Adhesion ◽  
Steel Substrates

Stainless steel is renowned for its wide use as a biomaterial, but its relatively high corrosion rate in physiological environments restricts many of its clinical applications. To overcome the corrosion resistance of stainless steel bio-implants in physiological environments and to improve its osseointegration behavior, we have developed a unique zein/hydroxyapatite (HA) composite coating on a stainless steel substrate by Electrophoretic Deposition (EPD). The EPD parameters were optimized using the Taguchi Design of experiments (DoE) approach. The EPD parameters, such as the concentration of bio-ceramic particles in the polymer solution, applied voltage and deposition time were optimized on stainless steel substrates by applying a mixed design orthogonal Taguchi array. The coatings were characterized by using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and wettability studies. SEM images and EDX results indicated that the zein/HA coating was successfully deposited onto the stainless steel substrates. The wettability and roughness studies elucidated the mildly hydrophilic nature of the zein/HA coatings, which confirmed the suitability of the developed coatings for biomedical applications. Zein/HA coatings improved the corrosion resistance of bare 316L stainless steel. Moreover, zein/HA coatings showed strong adhesion with the 316L SS substrate for biomedical applications. Zein/HA developed dense HA crystals upon immersion in simulated body fluid, which confirmed the bone binding ability of the coatings. Thus the zein/HA coatings presented in this study have a strong potential to be considered for orthopedic applications.

Effect of diffusion alloying time on corrosion resistance and surface conductivity of niobium-alloying-modified AISI430 stainless steel for DFAFC bipolar plate

2019 ◽  
Vol 66 (2) ◽  
pp. 222-229 ◽  
Author(s):  
Jixin Han ◽  
Haibang Zhang ◽  
Juncai Sun ◽  
Wenyuan Zhao ◽  
Jinlong Cui
Keyword(s):  
Electrical Conductivity ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Formic Acid ◽  
Corrosion Current ◽  
Bipolar Plate ◽  
Surface Conductivity ◽  
Content Type ◽  
Diffusion Layers ◽  
Surface Electrical Conductivity

Purpose The purpose of this study is to improve the surface electrical conductivity and corrosion resistance of AISI430 stainless steel (430 SS) as bipolar plates for direct formic acid fuel cell (DFAFC). Design/methodology/approach The niobium diffusion layers have been successfully synthesized on 430 SS substrate by the plasma surface diffusion alloying technique under different diffusion alloying time. Findings The surface morphology of Nb-modified 430 SS prepared under the diffusion alloying time of 2 h is more homogeneous, relatively sleek and compact without surface micropore and other common surface blemishes. The potentiostatic and potentiodynamic polarization measurements manifest that Nb-modified 430 SS prepared under the diffusion alloying time of 2 h enormously ameliorate the corrosion resistance of bare 430 SS compared with other Nb-modified 430 SS samples and its corrosion current density is maintained at −1.4 µA cm−2 in simulated anodic environment of DFAFC (0.05 M H2SO4 + 2 ppm HF + 10 M formic acid at 50 °C). Originality/value The effect of diffusion alloying time on the corrosion resistance and surface conductivity of Nb-modified 430 SS has been carefully studied. The Nb-modified 430 SS samples prepared at the diffusion alloying time of 2 h have the best surface electrical conductivity and corrosion resistance in the simulated anodic environment of DFAFC.

Bias voltage effect on magnetron sputtered titanium aluminum nitride TiAlN thin films properties

2019 ◽  
Vol 86 (3) ◽  
pp. 30301 ◽  
Author(s):  
Zouina Amina Ait-Djafer ◽  
Nadia Saoula ◽  
Daniel Wamwangi ◽  
Noureddine Madaoui ◽  
Hamid Aknouche
Keyword(s):  
Thin Films ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Bias Voltage ◽  
Steel Substrate ◽  
Rf Magnetron Sputtering ◽  
Substrate Bias Voltage ◽  
Tialn Coating ◽  
Fcc Phase ◽  
Steel Substrates

In this study, a negative substrate bias voltage is used to tune the structural, morphological, mechanical and electrochemical properties of TiAlN coatings fundamental for protective coating applications. TiAlN thin films have been deposited on glass, (001)Si and stainless steel substrates by RF magnetron sputtering at a power density of 4.41 W/cm2. The deposition rate was determined from X-ray reflectivity measurements to 7.00 ± 0.05 nm/min. TiAlN films used in this work were deposited for 60 min to yield a film thickness of 420 nm. Structural analysis has shown that TiAlN coating forms a cubic (fcc) phase with orientations in (111), (200), (220) and (222) planes. The deposited coatings present maximum hardness (H = 37.9 GPa) at −75 V. The dependence of hardness and Young's modulus and corrosion resistance on microstructure has been established. Electrochemical studies by potentiodynamic polarization in aggressive environment (3.5 wt.% NaCl) have revealed that stainless steel substrate with TiAlN coating exhibits excellent corrosion resistance.

scholarly journals Improvement of Corrosion Resistance and Electrical Conductivity of Stainless Steel 316L Bipolar Plate by Pickling and Passivation

2021 ◽  
Vol 12 (3) ◽  
pp. 101
Author(s):  
Yu Leng ◽  
Daijun Yang ◽  
Pingwen Ming ◽  
Bing Li ◽  
Cunman Zhang
Keyword(s):  
Electrical Conductivity ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Photoelectron Spectroscopy ◽  
Proton Exchange Membrane ◽  
Bipolar Plate ◽  
Proton Exchange ◽  
Stainless Steel 316L ◽  
Force Microscopy ◽  
Exchange Membrane

Corrosion resistance and electrical conductivity of stainless steel bipolar plate remains a big challenge while it has been regarded as the most promising candidate for proton exchange membrane fuel cell. The purpose of this paper is to study the effects of pickling and passivation by sulfuric acid and a mixture of nitric and fluoric acids, respectively, on corrosion resistance and electrical conductivity of stainless steel 316L (SS316L) bipolar plate. First, pickling of the specimens of SS316L is performed in a 15 wt.% H2SO4. Afterwards, the specimens are passivated in a mixture of 12 wt.% HF and 4 wt.% HNO3. Electrochemical and interfacial conductivity tests are conducted to examine the change in corrosion resistance and electrical conductivity of SS316L. Finally, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) reveal the evolution of surface morphology, chemical composition and surface conductivity. The results show that the corrosion resistance and electrical conductivity of SS316L could be improved significantly by pickling and passivation. The increase in Cr:Fe ratio as well as a more uniform surface with higher conductivity is the main reason for the improvement of corrosion resistance and interfacial conductivity of SS316L.

A Novel Method for Measuring the Temperature Distribution Within the Fuel Cell Using Array Micro Sensors

2006 ◽  
Author(s):  
Chi-Yuan Lee ◽  
Shuo-Jen Lee ◽  
Chi-Lieh Hsieh ◽  
Guan-Wei Wu ◽  
Yu-Ming Lee ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Fuel Cell ◽  
Temperature Distribution ◽  
Steel Substrate ◽  
Bipolar Plate ◽  
Temperature Sensors ◽  
Micro Electro Mechanical Systems ◽  
Metallic Bipolar Plate ◽  
Good Conductor ◽  
Set Up

The fuel cell has the potential to become an important source of electric power. However, measuring the temperature inside the fuel cell is difficult. Hence, in this investigation, array of micro sensors are set up inside a fuel cell to measure the temperature distribution. The substrate of the bipolar plate in a fuel cell is made of stainless steel (SS-316) and the electroforming technique is implemented to fabricate channels in the stainless steel substrate. Then NEMS (Micro-Electro-Mechanical Systems) technologies are employed to fabricate the platinum temperature sensor on the rib of a channel of stainless steel. The major advantages of array micro platinum temperature sensors are their small volume, high accuracy, short response time, simplicity in their fabrication, their mass production and ability to measure the temperature precisely and more effectively than a traditional thermocouple. The stainless steel bipolar plate is a good conductor of electric and heat. It has high mechanical strength and is non-porous. The graphite bipolar plate does not have such extensive advantages. This work electroforms a channel on stainless steel and then fabricates an array of micro temperature sensors on the rib of the channel. It is used to measure the temperature distribution at all locations in a fuel cell with a metallic bipolar plate. In the experiment, the temperature- is measured from 31 to 80 degrees Celsius and its resistance range from 0.593 to 0.649 ohm. The experimental results demonstrate that the temperature was almost linearly related to the resistance and the accuracy and sensitivity are under 1 degrees Celsius and 1.85×10−3 over degrees Celsius, respectively.

Preparation of Multi-Layer Film on Stainless Steel as Bipolar Plate for Polymer Electrolyte Membrane Fuel Cell

2010 ◽  
Vol 113-116 ◽  
pp. 2255-2261
Author(s):  
Dong Ming Zhang ◽  
Lu Guo ◽  
Liang Tao Duan ◽  
Zai Yi Wang
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Fuel Cell ◽  
Polymer Electrolyte ◽  
Polymer Electrolyte Membrane ◽  
Electrical Conductance ◽  
Bipolar Plate ◽  
Contact Angles ◽  
Water Contact ◽  
Electrolyte Membrane

In the present study, we try to prepare hydrophobic film coated on stainless steel as the bipolar plate for polymer electrolyte membrane fuel cell (PEMFC). Magnetron sputtering (MS) was adoped to prepare the Cr3Ni2/Cr2N multi-layer coated on stainless steel. The corrosion resistance and electrical conductance of the coated substrate were tested. The water contact angles were measured. The film exhibits improved corrosion resistance and electrical conductance. The corrosion current is 0.58µA.cm-2 and the contact resistance at 240N.cm-2 is 8.5mΩ.cm2. Meanwhile, it is a kind of hydrophobic film with water contact angle of 107o. The performance shows strong dependance on microstructural characteristics. The nano-protrudes on the SS304/Cr3Ni2/Cr2N surface result in the film with hydrophobic property, just like the effect of lotus surface.

A Review of Corrosion Resistance Method on Stainless Steel Bipolar plate

2018 ◽  
Vol 5 (9) ◽  
pp. 17852-17856
Author(s):  
Pramod Mandal ◽  
Uttam kumar Chanda ◽  
Sudesna Roy
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Bipolar Plate ◽  
Resistance Method
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