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Določevanje hitrosti rasti razpoke v korozivnih medijih z elektrokemično polarizacijo = Determination of crack growth in corrosion medium by electrochemical polarizationTandler, Marko ; Vehovar, LeopoldNedavno so ugotovili, da bi lahko bila hitrost enakomernega raztezanja (i[spodaj](ss) dobljena iz korozijske krivulje raztezanja pri konstantni obremenitvi, neposreden parameter za napoved časa do ... zloma, ali kriterij za oceno občutljivosti kovin do dnapetosno korozijskega pokanja, če so te izpostavljene korozivnemu mediju. Iz tega razloga je bila izdelana posebna korozijska celica, sprememba raztezka, ki je bil registriran na vzorcu, pa je bila določena z dvema indukcijskima merilnikoma z natančnostjo <0,15 [mi]m. Nerjavno jeklo vrste 304 je bilo testirano v 10% HCl pri sobni temperaturi in konstantni obremenitvi 90% R[spodaj](p0,2). Vzorci so bili anodno polarizirani z gostoto toka 3,7 mA/cm[na]2. Ugotovljeno je bilo, da se pri vrednostih za i[spodaj](ss) od 10[na](-9) do 10[na](-10) m/s ali manj ne pojavi pokanje v času laboratorijskega preizkušanja 336 ur. To pomeni, da je i[spodaj](ss) postal kriterij za vrednotenje občutljivosti proti napetostni koroziji. S katodno polarizacijo različnih maloogljičnih konstrukcijskih jekel je bila raziskovana vodikova krhkost. Pri konstantni obremenitvi (80% od R[spodaj]e) so bila omenjena jekla polarizirana pri sobni temperaturi v 1N H[spodaj]2SO[spodaj]4 + 1 mg As[spodaj]2O[spodaj]3/l. Ti rezultati so jasno pokazali da ta metoda omogoča primerno selekcijo med različnimi vrstami jekel. Pri velikosti za i[spodaj](ss) med 10[na](-9) in 10[na](-10) m/s, so bili časi pokanja preizkušanih vzorcev različni. Ugotovitve fraktografskih analiz prelomnih površin so pokazale, da je čas do zloma strogo odvisen od količine in narave plasti (to so oksidni ali sulfidni vključki), ki so povzročitelji vodikove krhkosti.Source: Program in knjiga povzetkov (Str. 165)Type of material - conference contribution ; adult, seriousPublish date - 1998Language - slovenian, englishCOBISS.SI-ID - 125610
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Tandler, Marko | 17081 |
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