Corrosion behavior of sputter-deposited Co-base alloy films in neutral solutions

Kawashima, A.; Habazaki, H.; Asami, K.; Hashimoto, Kôji; Murata, Hideo; Ichikawa, Kunihiko; Fujii, Satoshi; Shinohara, Takanobu

doi:10.1016/0921-5093(94)90812-5

Materials Science and Engineering: A

1994

DOI: 10.1016/0921-5093(94)90812-5

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Corrosion behavior of sputter-deposited Co-base alloy films in neutral solutions

A. Kawashima¹,

H. Habazaki²,

K. Asami³

et al.

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Cited by 6 publications

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“…However, these DLC overcoats are very thin (currently Ϸ3 nm). Even though the present-day magnetic cobaltbased alloys contain a significant concentration of chromium and are fairly corrosion resistant, 8 corrosion of the magnetic alloy has been found at pores in 4, 9 8, 10 and 10 nm 11 thick DLC.…”

mentioning

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Influence of Nanothick Layers of DLC on the Rates of Electrochemical Reduction Reactions on Magnetic Hard Disks

Jung

Devine

2004

J. Electrochem. Soc.

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Potentiodynamic cathodic polarization tests and electrochemical impedance spectra were obtained for magnetic hard disks coated with a layer of diamond-like carbon ͑DLC͒ and immersed in aqueous borate buffer ͑pH 8.4͒ containing 0.1 M NaCl. The log of the cathodic current was linearly related to (⌬ Ϫ ⌬ corr ) 1/2 for disks coated with a layer of DLC and polarized between 0.2 and 0.4 V below the corrosion potential. In addition, the low frequency impedance of the disks coated with a layer of DLC decreased by a factor of ϳ50 as the potential was decreased from 0.2 to 0.4 V below the corrosion potential. The results were independent of the DLC's thickness ͑2-5 nm͒, dopant ͑H and H ϩ N) and method of deposition ͑sputtering and ion-beam deposition͒. The results suggest the presence of a thin ͑Ϸ12-19 Å͒ charge-denuded layer that forms by a reaction between the DLC and either air or the aqueous solution. At potentials within Ϫ0.4 V of the corrosion potential, the kinetics of the electrochemical reduction reactions on DLC-coated hard disks are explained equally well by Schottky emission or quantum mechanical tunneling of electrons through the charge-denuded, reaction product layer. Both charge-transport mechanisms suggest similar remedial actions for decreasing corrosion of the magnetic layer.The magnetic metallic alloy that is used for information storage in hard disks is protected against wear and corrosion by a carbon overcoat. 1,2 Decreasing the thickness of the carbon overcoat increases the storage density of the disk by allowing the read/write head to come closer to the magnetic alloy. As the thickness of the overcoat has decreased, the incidence of corrosion of the magnetic layer has increased.Early work 3-5 demonstrated that relatively thick ͑e.g., 20-100 nm͒, electrically conductive carbon overcoats galvanically couple to the metallic substrate and greatly accelerate the corrosion of the magnetic alloy where it is exposed at holes in the carbon overcoat.Current technology makes use of carbon overcoats of diamondlike carbon ͑DLC͒, which have very high electrical resistivity, 6,7 and low porosity. However, these DLC overcoats are very thin (currently Ϸ3 nm). Even though the present-day magnetic cobaltbased alloys contain a significant concentration of chromium and are fairly corrosion resistant, 8 corrosion of the magnetic alloy has been found at pores in 4, 9 8, 10 and 10 nm 11 thick DLC.Earlier, we reported the pitting corrosion of a Co-Cr alloy at holes in DLC layers that were 3-8 nm thick. 12 The pitting potential of the Co-Cr alloy measured on hard disks not covered by a layer of DLC is quite high, approximately ϩ0.8 V vs. SCE in an aqueous solution of 0.01 M Na 3 BO 4 ϩ 0.01 M B(OH) 3 ϩ 0.1 M NaCl ͑pH 8.4͒. In potentiodynamic polarization tests of disks coated with DLC and immersed in the borate buffer ϩ chloride solution, pitting corrosion initiated at potentials above 0.9 V vs. SCE.The susceptibility of hard disks to pitting corrosion in very oxidizing conditions has been exploited as a method for determinin...

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confidence: 99%

Influence of Nanothick Layers of DLC on the Rates of Electrochemical Reduction Reactions on Magnetic Hard Disks

Jung

Devine

2004

J. Electrochem. Soc.

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A Ni- and Cu-free Zr-based bulk metallic glass with excellent resistance to stress corrosion cracking in simulated body fluids

Kawashima

Wada

Ohmura

et al. 2012

Materials Science and Engineering: A

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The corrosion behaviour of sputter-deposited amorphous Mn-Ta alloys in 0.5 M NaCl solution

et al. 1997

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Corrosion behavior of sputter-deposited Co-base alloy films in neutral solutions

Cited by 6 publications

References 9 publications

Influence of Nanothick Layers of DLC on the Rates of Electrochemical Reduction Reactions on Magnetic Hard Disks

Influence of Nanothick Layers of DLC on the Rates of Electrochemical Reduction Reactions on Magnetic Hard Disks

A Ni- and Cu-free Zr-based bulk metallic glass with excellent resistance to stress corrosion cracking in simulated body fluids

The corrosion behaviour of sputter-deposited amorphous Mn-Ta alloys in 0.5 M NaCl solution

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