thx guys
how dumb am I, I never even heard of Google Scholar !
""There isn't much published on this topic, but I can tell you that austenitic stainless steels behave very similarly whether the austenite is stabilized by manganese or nickel.""
but the 1% nickel grades are the more prone to...
maybe you guys would regard it as obvious, but I was amazed by the deformation of the copper. its pretty thin sheet and its relatively soft copper but still amazing to me
of course this was just a pan and it aint going to kill anyone, but
it really brought home the 'power' of corrosion product...
all this talk of saucepans made me wonder if anyone had any information on the delayed cracking of 200 series stainless steel.
this is something that can happen to 200 series deep drawn cookware (usually but not exclusively the 1% nickel grades rather than the traditional AISI 201/202 types)
i...
caustic soda, yeah good idea - common household stuff.
Ok my theory - she leaves it sat in caustic overnight to clean the copper - the copper has blackened in use or perhaps overheated.
(the pan is a bit 'leaky' already, or got more 'leaky' due to overheating.any delamination of...
Ok thx guys.
There did not seem to be any signs of overheating - usually the inside of the pan will show evidence of this, but then again the copper could still have got hot enough to be damaged as suggested.
Having tried to get more info - I still don't know how long the pan was in use, it...
yeah, alkali detergent and salt in the detergent, great combo for getting trapped in a crevice with dissimilar metals in contact !
then heat applied in use speeding up any chemical attack perhaps, maybe concentration of any corrosive stuff by evaporation in heating too, then back in dishwasher...
last pic - wire brushed off the white corrosion product - the aluminium is certainly extensively corroded, so assume the source of all or most of the 'white...
pic of 'clean' copper surface and green corrosion producthttp://files.engineering.com/getfile.aspx?folder=3f94844d-4f8e-442e-a941-8e86151cd139&file=pan-base2.jpg
and another pic showing the copper base circumference deformationhttp://files.engineering.com/getfile.aspx?folder=c16160f8-fb5a-4cf5-a550-383b19bcb158&file=pan-base.jpg
oh only one pic was attached - heres another - cross-section of the
pan basehttp://files.engineering.com/getfile.aspx?folder=1bcba29c-4596-4352-8397-cd461913b5f1&file=pan_base-cross-section.jpg
This is a interesting case study i think, for anyone interested in corrosion/failure analysis. The question is - what on earth has the user done to this pan!?
If you look at the pics (the white bit on the base is just where i blanked out the manufacturer)- this is a standard encapsulated...
