7.6 Zmiana struktury warstwy aSiCN(H) na stalach po ekspozycji
7.6.4 Podsumowanie zmian struktury warstwy w wyniku procesów korozji
Warstwa aSiCN(H) osadzona na stopach chromowo-niklowych zmienia skład chemiczny i strukturę w wyniku oddziaływania ośrodka korozyjnego (r. Ringera). Składniki warstwy ulegają utlenianiu (głównie azot, krzem i wodór) oraz roztwarzaniu (głównie azot). W warstwę ponadto wbudowują się składniki podłoża, zwłaszcza w przypadku stopów klasycznych (S304,. S316) oraz stopu duplex (S324).
121
8 Wnioski
Odporność korozyjną stopów chromowo-niklowych w wodnych roztworach chlorków można podwyższyć wprowadzając krzem jako dodatek stopowy lub poprzez osadzenie warstwy amorficznej aSiCN(H) techniką PECVD.
• Krzem jako dodatek stopowy może przejmować rolę chromu i determinować przebieg procesu pasywacji, istotnie zmieniając strukturę i właściwości warstwy pasywnej.
• Stężenie krzemu w stopie, zmieniające mechanizm procesu pasywacji zależy od mikrostruktury stopu.
• Dla stopu dwufazowego austenityczno – ferrytycznego (324), niewielkie stężenie krzemu (1,2% at.) jest wystarczające do zmiany mechanizmu procesu pasywacji i skutkuje wysokim stopniem segregacji oraz wzbogaceniem warstwy pasywnej w krzem. Stopień wzbogacenia (xSiw warstwie / xSi w stopie) wynosi ~50. • Dla stopu austenitycznego S326 zawierającego 10% at. Si stopień wzbogacenia
wynosi ~60.
• Amorficzna warstwa wieloskładnikowa aSiCN(H) zabezpiecza odporność korozyjną badanych gatunków stali w wodnych roztworach soli przy podwyższonej temperaturze, zwłaszcza na korozję lokalną.
• Najlepsze właściwości ochronne warstwy aSiCN(H) obserwowano w przypadku stali klasycznych S30403 i S31615.
• Zróżnicowane zachowanie się warstwy związane jest z wpływem podłoża na jej mikrostrukturę.
122
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