Acceleration Factor for Tarnish Testing of Silver Contact Surface

Terutaka TAMAI; Yasuhiro KURANAGA

Acceleration Factor for Tarnish Testing of Silver Contact Surface

Terutaka TAMAI, Yasuhiro KURANAGA

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Silver is a fundamental material for electrical contact application. In spite of high electrical conductivity and economical advantage, silver surface is corroded easily by environment contained sulfide. A corrosion product as Ag₂S deteriorates the property of contact reliability. In order to examine contact reliability, the acceleration tests have been accepted widely in industries. In the present study, the acceleration factor of the contact reliability for the sulfide film on the surface of silver contact which was subject to the tarnish acceleration test was clarified in comparison with the film grown in a normal office environment. The accelerated environment based on the Japan Electric Industry Development Association (JEIDA) standard No.25 was adopted. This environment is consisted of air contained 3 ppm H₂S gas under 40, 85-95% RH. The growth rate of the sulfide film (Ag₂S) was evaluated by applying the ellipsometry analysis. In the results, it was found that growth of Ag₂S film of 500 in thickness in the normal office environment required corrosion time of 310³ h. This thickness of 500 caused increase in contact resistance of 0.1-1.0 (Ω). However, in the accelerated environment, corrosion time decreased to 1.7 h for same thickness. Therefore, the acceleration factor was obtained by comparison of these time as 1.810³ for the standard test of JEIDA.

Publication: IEICE TRANSACTIONS on Electronics Vol.E78-C No.9 pp.1273-1278

Publication Date: 1995/09/25

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Type of Manuscript: PAPER

Category: Electronic Circuits

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Terutaka TAMAI, Yasuhiro KURANAGA, "Acceleration Factor for Tarnish Testing of Silver Contact Surface" in IEICE TRANSACTIONS on Electronics, vol. E78-C, no. 9, pp. 1273-1278, September 1995, doi: .
Abstract: Silver is a fundamental material for electrical contact application. In spite of high electrical conductivity and economical advantage, silver surface is corroded easily by environment contained sulfide. A corrosion product as Ag₂S deteriorates the property of contact reliability. In order to examine contact reliability, the acceleration tests have been accepted widely in industries. In the present study, the acceleration factor of the contact reliability for the sulfide film on the surface of silver contact which was subject to the tarnish acceleration test was clarified in comparison with the film grown in a normal office environment. The accelerated environment based on the Japan Electric Industry Development Association (JEIDA) standard No.25 was adopted. This environment is consisted of air contained 3 ppm H₂S gas under 40, 85-95% RH. The growth rate of the sulfide film (Ag₂S) was evaluated by applying the ellipsometry analysis. In the results, it was found that growth of Ag₂S film of 500 in thickness in the normal office environment required corrosion time of 310³ h. This thickness of 500 caused increase in contact resistance of 0.1-1.0 (Ω). However, in the accelerated environment, corrosion time decreased to 1.7 h for same thickness. Therefore, the acceleration factor was obtained by comparison of these time as 1.810³ for the standard test of JEIDA.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/e78-c_9_1273/_p

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@ARTICLE{e78-c_9_1273,
author={Terutaka TAMAI, Yasuhiro KURANAGA, },
journal={IEICE TRANSACTIONS on Electronics},
title={Acceleration Factor for Tarnish Testing of Silver Contact Surface},
year={1995},
volume={E78-C},
number={9},
pages={1273-1278},
abstract={Silver is a fundamental material for electrical contact application. In spite of high electrical conductivity and economical advantage, silver surface is corroded easily by environment contained sulfide. A corrosion product as Ag₂S deteriorates the property of contact reliability. In order to examine contact reliability, the acceleration tests have been accepted widely in industries. In the present study, the acceleration factor of the contact reliability for the sulfide film on the surface of silver contact which was subject to the tarnish acceleration test was clarified in comparison with the film grown in a normal office environment. The accelerated environment based on the Japan Electric Industry Development Association (JEIDA) standard No.25 was adopted. This environment is consisted of air contained 3 ppm H₂S gas under 40, 85-95% RH. The growth rate of the sulfide film (Ag₂S) was evaluated by applying the ellipsometry analysis. In the results, it was found that growth of Ag₂S film of 500 in thickness in the normal office environment required corrosion time of 310³ h. This thickness of 500 caused increase in contact resistance of 0.1-1.0 (Ω). However, in the accelerated environment, corrosion time decreased to 1.7 h for same thickness. Therefore, the acceleration factor was obtained by comparison of these time as 1.810³ for the standard test of JEIDA.},
keywords={},
doi={},
ISSN={},
month={September},}

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TY - JOUR
TI - Acceleration Factor for Tarnish Testing of Silver Contact Surface
T2 - IEICE TRANSACTIONS on Electronics
SP - 1273
EP - 1278
AU - Terutaka TAMAI
AU - Yasuhiro KURANAGA
PY - 1995
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E78-C
IS - 9
JA - IEICE TRANSACTIONS on Electronics
Y1 - September 1995
AB - Silver is a fundamental material for electrical contact application. In spite of high electrical conductivity and economical advantage, silver surface is corroded easily by environment contained sulfide. A corrosion product as Ag₂S deteriorates the property of contact reliability. In order to examine contact reliability, the acceleration tests have been accepted widely in industries. In the present study, the acceleration factor of the contact reliability for the sulfide film on the surface of silver contact which was subject to the tarnish acceleration test was clarified in comparison with the film grown in a normal office environment. The accelerated environment based on the Japan Electric Industry Development Association (JEIDA) standard No.25 was adopted. This environment is consisted of air contained 3 ppm H₂S gas under 40, 85-95% RH. The growth rate of the sulfide film (Ag₂S) was evaluated by applying the ellipsometry analysis. In the results, it was found that growth of Ag₂S film of 500 in thickness in the normal office environment required corrosion time of 310³ h. This thickness of 500 caused increase in contact resistance of 0.1-1.0 (Ω). However, in the accelerated environment, corrosion time decreased to 1.7 h for same thickness. Therefore, the acceleration factor was obtained by comparison of these time as 1.810³ for the standard test of JEIDA.
ER -