{"term":{"id":"00094","title":"activation","longtitle":"IUPAC Gold Book - activation","doi":"10.1351\/goldbook.A00094","code":"A00094","status":"current","definitions":[{"id":1,"text":"The process of transition from the passive to the active state by removal of the passivating film. A necessary condition for activation is an electrode potential negative to the equilibrium potential of formation of the passivating film. Activation is achieved by cathodic currents, by a reduced substance in the adjacent solution, or by contact with an electronic conductor having a suitably negative corrosion potential.","contexts":[],"links":[{"term":"activation","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/A00093"},{"term":"active state","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/A00111"},{"term":"corrosion potential","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/C01357"},{"term":"electrode potential","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/E01956"},{"term":"film","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/F02366"},{"term":"passive state","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/P04447"}],"sources":["PAC, 1989, 61, 19. 'Electrochemical corrosion nomenclature (Recommendations 1988)' on page 21 (https:\/\/doi.org\/10.1351\/pac198961010019)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/A00094\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/A00094\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/A00094\/plain"},"citation":"Citation: 'activation' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351\/goldbook.A00094","license":"The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https:\/\/creativecommons.org\/licenses\/by-sa\/4.0\/) for individual terms.","collection":"If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org .","disclaimer":"The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.","accessed":"2026-07-23T17:06:51+00:00"}}