Istraživanje naponsko-korozijskog prskanja zavarenog spoja čelika X70 pri katodnoj polarizaciji u blisko neutralnoj sredini
DOI:
https://doi.org/10.5937/zasmat2301096NKljučne reči:
čelik za cevi X70, zavareni spoj, skoro neutralna sredina, katodna polarizacija, naponskokoroziono pucanje, deformacija, voltametrija, fraktografijaApstrakt
Izvršeno je istraživanje naponsko-korozionog pucanja zavarenih spojeva od čelika X70 pri katodnoj polarizaciji u skoro neutralnom rastvoru NS4. Utvrđeno je da se sklonost osnovnog metala čelika X70 ka naponsko-korozionom pucanju, procenjena koeficijentom Ks, povećava sa 1,07 na 1,13, dok se polarizacioni potencijal menja od potencijala korozije do maksimalnog zaštitnog potencijala -1,05. Ovakva pravilnost je u korelaciji sa povećanjem prodora vodonika kroz čelik X70, koji je pri maksimalnom zaštitnom potencijalu -1,05 jednak 0,000518 mol/m3. Podložnost zavarenog spoja je manja od osnovnog metala, promena Ks koeficijenta nije mnogo blizu vrednosti 1,0. Sa povećanjem potencijala polarizacije sa -0,75 V na -1,05 površina loma čelika X70 karakteriše smanjenje veličine rupa i pojava ravnih površina, kroz koje je došlo do loma. Slična priroda rupture je primećena i za zavareni spoj, ali se može primetiti vizuelno već i udeo ravnih površina. Utvrđeno je da do pucanja zavarenog spoja dolazi na osnovnom metalu, što omogućava da se predloži faktor osetljivosti na naponsku koroziju Ks koji bi se legitimno koristio za procenu pucanja zavarenog spoja od naponske korozije, pod uslovom da je zavar izveden na visoko kvalitetan način. Rezultati prslina od naponske korozije zavarenog spoja čelika X70 zadovoljavaju e koreliraju sa iskustvom prslina od naponske korozije na magistralnim gasovodima, gde se prsline od naponske korozije formiraju i razvijaju duž osnovnog metala gasovoda.Reference
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