Corrosion Behavior of Sm-Based Bulk Metallic Glasses in Salt Solution

In this paper, the corrosion behaviors of Sm-based bulk metallic glasses (BMGs) were investigated by immersion test. It was found that with Co content increasing the ability of corrosion resistance of the alloy increases for Sm-based bulk metallic glasses. A comparison study was made on the corrosion behaviors between the glassy state alloys and crystalline alloys with the same ingredients. The results show that the glassy state alloy has the better corrosion resistance.

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Electrochemical Corrosion Behaviors of CuZrHfTi Bulk Metallic Glasses in NaOH Solution

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.178-181.1075 ◽

2012 ◽

Vol 178-181 ◽

pp. 1075-1078

Author(s):

Bin Sun ◽

Wen Yong Zhang ◽

Jin Bin Lu

Keyword(s):

Corrosion Resistance ◽

Current Density ◽

Metallic Glasses ◽

Electrochemical Impedance ◽

Bulk Metallic Glasses ◽

Electrochemical Corrosion ◽

Transfer Resistance ◽

Naoh Solution ◽

Corrosion Behaviors ◽

Passivation Current Density

The electrochemical corrosion behaviors of Cu60Zr30-xHfxTi10(x=10,15,20) bulk metallic glasses (BMGs) were investigated in 3 mol/L NaOH solution by potentiodynamic polarization experiments and electrochemical impedance spectroscopy (EIS). The results showed that the BMGs had sufficient corrosion resistance in NaOH solution. The anodic showed grading passivation character, and the passivation current density were very low. The corrosion resistance changed with Hf content changing. The passivation current density of Cu60Zr15Hf15Ti10 alloy was lowest and the charge transfer resistance was largest, which means the best corrosion resistance for CuZrHfTi BMGs. Corrosion mechanisms were not changed, while the corrosion resistance decrease after crystallized for the BMGs.

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Corrosion Behavior of Zr-Based Bulk Metallic Glasses by Addition of Ni

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.486.321 ◽

2012 ◽

Vol 486 ◽

pp. 321-327

Author(s):

Chuan Jie Yuan ◽

Xie Rong Zeng ◽

Hai Xia Qian ◽

Sheng Hui Xie

Keyword(s):

Corrosion Resistance ◽

Corrosion Behavior ◽

Metallic Glasses ◽

Alloy System ◽

Immersion Test ◽

Casting Method ◽

Glass Forming ◽

Polarization Test ◽

Corrosion Deposits ◽

Mould Casting

Fully amorphous Zr48Cu43-xAl7Ag2Nix(x=0, 2, 4, 6, 8 at. %) alloy system synthesized by Cu mould casting method were utilized to study corrosion behavior due to the poor corrosion resistance of Zr-Cu-Al-Ag alloy system by addition of Ni. High temperature DSC revealed that the Zr-based alloy system still maintained good glass-forming ability and thermal stability with the addition of Ni element. The result obtained from both the immersion test and the potentiodynamic polarization test showed that the addition of Ni element significantly improved the corrosion resistance compared to the Ni-free Zr-based alloy system. SEM graph showed a phenomenon of corrosive pit where there existed corrosion deposits as well as cellular textures and microcracks. In summary, proper addition of Ni could modify the corrosion resistance of the Zr-based alloy system.

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Chemical Composition and Corrosion Behavior of a-C:H/DLC Film-Coated Titanium Substrate in Simulated PEMFC Environment

Coatings ◽

10.3390/coatings11070820 ◽

2021 ◽

Vol 11 (7) ◽

pp. 820

Author(s):

Beibei Han ◽

Mengyuan Yan ◽

Dongying Ju ◽

Maorong Chai ◽

Susumu Sato

Keyword(s):

Corrosion Resistance ◽

Corrosion Behavior ◽

Metal Ion ◽

Ion Beam ◽

Titanium Substrate ◽

Corrosion Current ◽

Ion Concentration ◽

Bipolar Plates ◽

High Adhesion ◽

Corrosion Behaviors

The amorphous hydrogenated (a-C:H) film-coated titanium, using different CH4/H2 and deposition times, was prepared by the ion beam deposition (IBD) method, which has the advantage of high adhesion because of the graded interface mixes at the atomic level. The chemical characterizations and corrosion behaviors of a-C:H film were investigated and evaluated by SEM, AFM, Raman spectroscopy, EPMA, TEM and XPS. An a-C:H film-coated titanium was corroded at 0.8 V, 90 °C in a 0.5 mol/L H2SO4 solution for 168 h. The metal ion concentration in the H2SO4 corrosion solution and the potentiodynamic polarization behavior were evaluated. Results indicate that a higher CH4/H2 of 1:0 and a deposition time of 12 h can result in a minimum ID/IG ratio of 0.827, Ra of 5.76 nm, metal ion concentration of 0.34 ppm in the corrosion solution and a corrosion current of 0.23 µA/cm2. The current density in this work meets the DOE’s 2020 target of 1 µA/cm2. Electrical conductivity is inversely proportional to the corrosion resistance. The significant improvement in the corrosion resistance of the a-C:H film was mainly attributed to the increased sp3 element and nanocrystalline TiC phase in the penetration layer. As a result, the a-C:H film-coated titanium at CH4/H2 = 1:0 with improved anti-corrosion behavior creates a great potential for PEMFC bipolar plates.

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