Go to  Advanced Search

Analysis of corrosion products in stress corrosion cracks

Show full item record

Files in this item

Files Size Format Description   View
UBC_1976_A7 N54.pdf 12.40Mb Adobe Portable Document Format   View/Open
 
Title: Analysis of corrosion products in stress corrosion cracks
Author: Nikiforuk, Thomas Philip
Degree Master of Applied Science - MASc
Program Materials Engineering
Copyright Date: 1976
Subject Keywords Stress corrosion; Steel, Stainless -- Corrosion
Abstract: Circumferentially notched rods of three types of austenitic stainless steel were stress corroded under freely corroding conditions at their yield stress in boiling 154°C MgCl2, and boiling MgCl2 with additions of HCl, CoCl2, and FeCl3. Alloy types 304, 316, and 310 were chosen because of their known different stress corrosion susceptibility. The corrosion products formed on the stress corrosion fracture surface were analyzed by electron diffraction and energy dispersive x-ray analysis. Electron diffraction of corrosion products, both in situ and stripped from the fracture surface, showed the corrosion product was a spinel oxide in all cases. Qualitative x-ray analysis of corrosion products, in situ and stripped from the fracture surface, indicated the corrosion product formed on all alloys was enriched in chromium and contained lesser amounts of the elements iron, nickel, silicon, molybdenum, magnesium, phosphorous and chlorine. Observations led to the conclusion that the corrosion product formed in the cracks of the various alloys was similar, being predominantly a chromium enriched oxide spinel with possible traces of metal chlorides or a corundum type oxide. The presence of the spinel oxide was consistent with anticipated E-pH equilibrium within the crack. However, it was felt the variation in s.c.c. behaviour between the different alloys could not be adequately accounted for in terms of the composition of the oxide.
URI: http://hdl.handle.net/2429/19883
Series/Report no. UBC Retrospective Theses Digitization Project [http://www.library.ubc.ca/archives/retro_theses/]

This item appears in the following Collection(s)

Show full item record

All items in cIRcle are protected by copyright, with all rights reserved.

UBC Library
1961 East Mall
Vancouver, B.C.
Canada V6T 1Z1
Tel: 604-822-6375
Fax: 604-822-3893