œ = kò k @o 0 n É; c 8 ý” X ¢ R X N Ëù m Ç Ti-Cu-Ni ¶  ¥ ?ô £ Œ p §8 ý  ¹ ÅM × D] K ¡X ì Ä ” ¼Å k Ä — ¤V R Ë

Electrochemical Corrosion Behaviors of Amorphous Ti-Cu-Ni Alloys Produced by Using the Quenching Method

Hyun-Goo Kim

Department of Physics Education, Chosun University, Gwangju 61452, Korea

Hee-Jin Jang

Department of Materials Science and Engineering, Chosun University, Gwangju 61452, Korea (Received 8 July 2015 : revised 29 July 2015 : accepted 31 July 2015)

This study was undertaken to examine the electrochemical corrosion properties of amorphous Ti50Cu30Ni20, Ti70Cu10Ni20, and Ti75Cu15Ni10alloys prepared with various alloy composition by using the melt-spinning method. The potentiodynamic polarization showed that the corrosion potential (Ecorr) and the corrosion rate (icorr) of the Ti50Cu30Ni20 and Ti70Cu10Ni20 alloys were -0.078 and -0.082 VSCE and about 2.19 × 10⁻⁵ and 1.00 × 10⁻⁷ A/cm², respectively, in a pH 2 solution. The corrosion rate of the Ti70Cu10Ni20alloy was lower than that of the Ti50Cu30Ni20alloy.

This is explained by the fact that the corrosion resistance of the Ti70Cu10Ni20 alloy is primarily dominated by Ti. Also, the Ecorr and the icorr of the Ti70Cu10Ni20 and the Ti75Cu15Ni10 alloys were -0.082 and -0.248 VSCE and about 1.00 × 10⁻⁷ and 1.21 × 10⁻⁶ A/cm², respectively. The corrosion resistance of Ti70Cu10Ni20alloy was better than that of the Ti75Cu15Ni10alloy.

PACS numbers: 81.65.Kn

Keywords: Amorphous Ti-Cu-Ni alloys, Corrosion potential, Corrosion current density

u

œ = kò k @o  0 n É; c 8 ý” X ¢ R X N Ëù m Ç Ti-Cu-Ni ¶  ¥ ?ô £ Œ p §8 ý  ¹ ÅM × D] K ¡X ì Ä ” ¼Å k Ä — ¤V R Ë

™ »g ` @¦ 

›

¸‚@/†<Ɠ§ Óüt“o§¹¢¤õ, FgÅÒ 61452

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›

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(2015¸ 7Z4 8{9 ~ÃÎ6§, 2015¸£  7Z4 29{9 ú&ñ‘:r~ÃÎ6£§, 2015¸ 74 31{Z 9 >FSX‰&ñ)

pH 2“ íߖ$í ú6 xÓo\"f q&ñ|9 Ti50Cu30Ni20, Ti70Cu10Ni20,Õªo“¦ Ti⁷⁵Cu15Ni10½+ËFK[þt_ „ l

o†<Æ&h ÂÒd” :£¤$í`¦›¸ %i. Ti50Cu30Ni20õ Ti70Cu10Ni20 q&ñ|9 ½ËF+K_ ÂÒd”„0A (Ecorr)H y

Œ

•yŒ• €• -0.078 VSCE, -0.082 VSCE–Ð _ q5pw > 8£¤&÷ñ&%3ܼ 9, ÂÒd”5qภ(icorr)H€• 2.19 × 10⁻⁵ A/cm²õ 1.00 × 10⁻⁷A/cm²Ü¼–Ð Ti⁷⁰Cu10Ni20½+ËFK i_ ^corr Ti⁵⁰Cu30Ni20ËF+½K_ i^corr˜Ð 8 ±ú

>

 8£¤&ñ÷&#Q Ni †<Ê|¾Ós {9&½ñ+É âĺ ½+ËFK_ ?/d”$í“Ér Ti†<Ê|¾Ós Z}`¦Ãº2Ÿ¤8 ĺú½+É כ ܼ–Ð ÒqtyŒ•÷&

%

3. ¢¸ôÇ q&ñ|9 Ti70Cu10Ni20½+ËFKõ Ti75Cu15Ni10 ½+ËFK_ EcorrHyŒ•yŒ• €• -0.082 VSCEü< -0.248 VSCE–Ð Ti⁷⁰Cu10Ni20 ËF+½Ks 8 Z}> 8¤&£ñ÷&%3ܼ 9, i^corrH €• 1.00 × 10⁻⁷ A/cm²õ 1.21 × 10⁻⁶

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

A/cm ܼ–Ð Ti⁷⁰Cu10Ni20ËF+½K_ i^corr Ti⁷⁵Cu15Ni10ËF+½K_ i^corr˜Ð 8 ±ú ÂÒd” $†½Ó$ís 8 ĺ Ã

º½+É כ ܼ–Ð ÒqtyŒ•÷&%3.

PACS numbers: 81.65.Kn

Keywords:q&ñ|9 Ti-Cu-Ni ½+ËFK,ÂÒd”„0A, ÂÒd”5Åq•¸

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lo†<Æ&h ìrFGz´+«>`¦ :xŸK ½+ËFK_ ›¸$í\ Ér r«Ñ _

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II. ÷ m Ç] M ö U ê s0 n É

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:r z´+«>\ 6 x)aq&ñ|9 FK5Åq“Ér íH•¸ 99.9% s©œ“ Ti, Cu, Õªo“¦ Ni`¦ "é¶qÖ¦ (at.%)–Ð Ti⁵⁰Cu30Ni20, Ti₇₀Cu₁₀Ni₂₀, Õªo“¦ Ti75Cu₁₅Ni₁₀ s ÷&•¸2Ÿ¤ ™D¥½+ËôÇ

∗E-mail: [email protected]

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III. + s ÇÊ Ý õ m Í w Š²  o

Fig. 1“Ér melt-spinningZO`¦ 6 x #Œ ]jŒ•)a Ti₅₀Cu₃₀Ni₂₀, Ti₇₀Cu₁₀Ni₂₀, Õªo“¦ Ti75Cu₁₅Ni₁₀

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ߖôÇ q&ñ|9 xß¼H • 2θ = 40.8€ ^◦ ÂÒH\"f +þA$í÷&#Q

Fig. 1. (Color online) X-ray patterns of amorphous (a) Ti50Cu30Ni20, (b) Ti70Cu10Ni20, and Ti75Cu15Ni10 al- loys.

Ti₅₀Cu₃₀Ni₂₀ r«Ñ
 Ti75Cu₁₅Ni₁₀ ½+ËFKr«Ñ_ q&ñ|9 x

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 âĺ\H ÂÒd”„0A -0.05 VSCE\ 0>"f s ÂÒ

Fig. 2. (Color online) Polarization curves of the amor- phous Ti50Cu30Ni20 and Ti70Cu10Ni20 alloys in pH 2 buffer solution.

1 l

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Fig. 4H Fig. 2_ ìrFG/BG‚\"f 8£¤&ñôÇ E_corrü< icorr\¦

•

¸rôÇ כ s. Fig. 4(a)\
·p ü< °ú s q&ñ|9 Ti50Cu30Ni20õ Ti⁷⁰Cu10Ni20 ËF+½K_ E^corrH yŒ•yŒ• €•

−0.078 VSCE, -0.082 VSCE–Ð _ q5pw > 8£¤&ñ÷&%3“¦, Ti₇₅Cu₁₅Ni₁₀ ½+ËFK_ Ecorrr -0.248 V“É SCE–Ð Ér ¿º ½+Ë F

K˜Ð €•çߖ ±ú€Œ¤. [j ½+ËFK_ i^corrH Ti50Cu30Ni20½+ËFK s

 2.19 × 10⁻⁵A/cm², Ti75Cu15Ni10½+ËFKs 1.21 × 10⁻⁷

Fig. 3. Polarization curves of pure Ti, Cu, and Ni in pH 2 buffer solution.

A/cm², Ti70Cu10Ni20 ËF+½Ks 1.00 × 10⁻⁷ A/cm²Ü¼–Ð Ti75Cu15Ni10, Ti70Cu10Ni20ËF½+K_ icorr Ti50Cu30Ni20

½

+ËFK_ icorr˜Ð s`› ±ú€Œ¤ (Fig. 4(b)). Ti75Cu15Ni10

x9

 Ti₇₀Cu10Ni20 ½+ËFK_ icorr Ti50Cu30Ni20 ½+ËFK˜Ð

8 ±ú“Érכ “Ér Ecorrs©œ\"f¸$Öío xß¼ \Os Bĺ Z}“Ér

„

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l

x`¦˜Ð“ Ti_ %ò†¾Ó\ l“ôÇ כ ܼ–Ð ÆÒ&ñ)a (Fig. 3).



"f Ni_ †<Ê|¾Ós 20%–Ð {9&ôñÇ ½+ËFK_ âĺ\H Ti

†

<Ê|¾Ós Z}“ÉrËF½+K_ ?/d”$ís Z41pxy ĺúôÇ כ ܼ–Ð Òqt y

Œ

•)a. Ti_ †<Ê|¾Ós 70 ∼ 75%“ ¿ º ½+ËFK_ icorr“Ér q 5

p

wôÇ Ãºïr
s, ÂÒ1lxI :£¤$ 8í £¤€\"fHÂÒd”„0ASX‰ z

´ > ÂÒ1lxI ½¨çߖ ?/\ 0Au H Ti75Cu15Ni10 ½+ËFK s

 ›¸FK 8 îߖ&&ñh“ ?/d” 1lx`¦
è­q ú e”`¦כ ܼ

–

Ð ÆÒ&ñ)a.

q

&ñ|9 Ti70Cu10Ni20 ËF+½Kõ Ti75Cu15Ni10 ½+ËFK _

 EcorrH yŒ•y• €Œ • -0.082 VSCEü< -0.248 VSCE–Ð Ti70Cu10Ni20 ½+ËFKs 8 Z}> 8£¤&ñ÷&%3ܼ 9 (a), icorrH

€



• 1.00 × 10⁻⁷ A/cm² õ 1.21×10⁻⁷ A/cm² ܼ–Ð Ti70Cu10Ni20½+ËFK_ icorr Ti75Cu15Ni10½+ËFK_ icorr˜Ð



 8 ±ú> 8£¤&ñ÷&#Q ÂÒd” $†½Ó$ís 8 ĺú½+É כ ܼ–Ð Òq

tyŒ•÷&%3 (b). Ti70Cu10Ni20 ËF+½K_ ÂÒd” $†½Ó$ís Ti75Cu15Ni10 ½+ËFK˜Ð 8 a~“%Ér כ “Ér Fig. 3\"f ^¦ ú e”

1pws q“§& ±h ú“Ér„0A %ò%i\"fH Ni sÉr 5Åq•¸–Ð Â

Òd”÷&
 HÖ¸$ío xß¼\¦
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A$í\ s`› a~“%Ér%ò†¾Ó`¦zul M:ëH“  Üכ¼–Ð ÒqtyŒ•)a



.

Fig. 4. (a) Corrosion potentials and (b) corrosion rates for Ti50Cu30Ni20, Ti70Cu10Ni20, and Ti75Cu15Ni10 al- loys in pH 2 buffer solution.

IV. + s Ç Â ] Ø

pH 2“ íߖ$í 6 xӐo\"f q&ñ|9 Ti50Cu30Ni20, Ti70Cu10Ni20,Õªo“¦ Ti⁷⁵Cu15Ni10 ½+ËFK[þt_ „lo†<Æ

&

h ÂÒd” :£¤$í`¦©œ@/&Üh¼–Ð q“§ %i. Ti50Cu₃₀Ni₂₀õ Ti₇₀Cu₁₀Ni₂₀ q&ñ|9 ½+ËFK_ EcorrH yŒ•yŒ• €• -0.078 VSCE, -0.082 VSCE–Ð _ q5pw% iܼ 9, i^corrH€• 2.19

× 10⁻⁵ A/cm²õ 1.00×10⁻⁷ A/cm²Ü¼–Ð Ti⁷⁰Cu10Ni20

½

+ËFK_ icorr Ti50Cu₃₀Ni₂₀ ËF+½K_ icorr˜Ð 8 ±ú Ni20ܼ–Ð {9&ñ½+É âĺ Ti†<Ê|Ós¾ Z}`¦Ãº2¤Ÿ ?/d”$ís 8 Ä

ºÃº½+É כ ܼ–Ð ÒqtyŒ•÷&%3. ¢¸ôÇ q&ñ|9 Ti70Cu10Ni20

½

+ËFKõ Ti75Cu₁₅Ni₁₀ ½+ËFK_ EcorrH yŒ•yŒ• €• -0.082 V_SCEü< -0.248 VSCE–Ð Ti70Cu₁₀Ni₂₀ ½+ËFKs 8 Z}

>

 8¤&£ñ÷&%3ܼ 9, i^corrH €• 1.00 × 10⁻⁷ A/cm² õ 1.21 × 10⁻⁶ A/cm² ܼ–Ð Ti⁷⁰Cu10Ni20 ½+ËFK_ i^corr Ti₇₅Cu₁₅Ni₁₀½+ËFK_ icorr˜Ð 8 ±ú ÂÒd” $†½Ó$ís 8 Ä

ºÃº½+É כ ܼ–Ð ÒqtyŒ•÷&%3.

ACKNOWLEDGEMENTS

This study was supported by research fund from Chosun University, 2015.

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