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13.
Študij elektrokemičnih lastnosti osnovne mase ledeburitnih orodnih jekel
Grešovnik, Ferdo
Elektrokemične lastnosti osnovne strukture ledeburitnih orodnih jekel smo razsikovali s snemanjem polarizacijskih krivulj. Meritve smo opravili na enajst vrstah ledeburitnih orodnih jekel. Vzorci so ...bili različno toplotno obdelani: žarjeni, kaljeni s temperaturi 900 oC, 980 oC, 1040 oC, 1120 oC in 1200 oC ter po kaljenju z navedenih temparatur še popuščani pri 200 oC in 550 oC. Za snemanje polarizacijskih krivulj smo uporabili samo eno vrsto elektrolita: 3% raztopino Kbr v vodi. Poskusi so pokazali, da med preiskovanimi vrstami ledeburitnih orodnih jekel ni bistvene razlike v elektrokemičnih lastnostih, če so vzorci enako toplotno obdelani. Na elektrokemične lastnosti močno vpliva temperatura, s aktere vzorce kalimo. Vpliv avstenitizacijske temperature se pozna tudi po naknadnem popuščanju. Čimvišja je temperatura avstenitizacije, tem žlahtnejša je osnova preiskovanihjekel. Ugotovili smo, da bi izolacija karbidov pri vseh preiskovanih vzorcih potekala dovolj hitro že pri potenciali - 200 mV.
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