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Cover Picture: Materials and Corrosion. 5/2014
Publication year - 2014
Publication title -
materials and corrosion
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201470051
Subject(s) - materials science , corrosion , electrochemical noise , pitting corrosion , cladding (metalworking) , chloride , metallurgy , molybdenum , electrochemistry , anode , chemistry , electrode
Cover: The determination of critical pitting temperatures (CPTs) in specific test media is a common testing method for the pit‐ting corrosion resistance of high alloyed materials. Com‐monly used test solutions for high alloyed steels like the ferric chloride test (ASTM G48) or the “Green Death” test have limitations using them for the highest alloyed Ni‐Cr‐Mo alloys. Furthermore the iterative test procedures limit their accuracy and effectiveness. To overcome these problems CPTs were determined by the examination of electrochemical current noise signals in a continuously heated 4.5 M calcium chloride solution under potentiostatic control, taking into account the limitation of pitting in the anodic range on alloys with a very high content of molybdenum. The new testing procedure also enables a significant better accuracy allowing an effective screening of cladding parameter and surface pre‐treatments on the resulting corrosion protection performance. More detailed information can be found in: S. Schmigalla, A. Heyn; Determination of critical pitting temperatures for Ni‐Cr‐Mo alloys using electrochemical noise measurements; Materials and Corrosion 2013, 64 , 700.