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Corrosion resistance of nickel in artificial sweat and synthetic seawater
Author(s) -
Randin JeanPaul
Publication year - 1987
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.19870380505
Subject(s) - corrosion , nickel , seawater , artificial seawater , metallurgy , materials science , electrochemistry , electrolyte , chemistry , electrode , oceanography , geology
The corrosion resistance of nickel 200 has been determined in artificial sweats (perspiration) and in synthetic seawater by several electrochemical methods. Nickel 200 is not stable in the two electrolytes investigated and the attack occurs with the formation of pits. The electrochemical behaviour is characterized by a short passive region with a current density of about 0.1 mA/cm 2 then by a transpassive region. The corrosion rate has been measured in N 2 ‐and O 2 ‐saturated electroytes by the potentiostatic (10 mV potential step per min), polarization resistance in the vicinity of the corrosion potential and ac impedance methods. The three techniques gave comparable results. Corrosion rates were roughly 10 times larger in artificial sweat than in seawater. Nickel 200 cannot be used for application where it may be in direct contact with the skin because of its high corrosion rate in oxygenated sweat. The released nickel ion is responsible for contact dermatitis observed in some individuals.