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Corrosion testing data extrapolation for Aluminium & its alloys

Corrosion testing data extrapolation for Aluminium & its alloys

Corrosion testing data extrapolation for Aluminium & its alloys

Hi All

Recently i had been asked to check the corrosion rate of Aluminium alloys from interaction with a few 'low use' solutions and compounds. While i couldnot find anything in handbooks, i moved on to research papers and books.... the past research (ie generation of corrosion data from these compounds) had focused on steel only, whereas the performance specs (ie coupon specification for testing data / MIL-STDS of these compounds) focused on steel, bronze and brass only.

now my question is:

1. will the behaviour be same / similar for aluminium as it is for steel?
2. Is it necessary to caliberate the corrosion data for corrosion specs with steel. i mean, can the corrosion rates for other metals be interpolated or extrapolated from steel-data?
3. Will the cleaning procedures,as developed for steel, be applicable to aluminium as well?

PS:[indent]i am not a material specialist. Apologies for asking very basics

Regards and thanks for ur time

RE: Corrosion testing data extrapolation for Aluminium & its alloys

Unless you can find published data you have no idea of how it will behave.
You cannot in general infer from one alloy system to another because the corrosion mechanisms (and limiting pathways) are likely very different.
Cleaning and surface prep is also highly alloy specific.
That said, if I had data for Zn and Sn I might be willing to take a guess for Al, but I would not be surprised to be wrong.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

RE: Corrosion testing data extrapolation for Aluminium & its alloys

many thanks sir

ur reply makes me say that its a gap in existing research... which i can use to explore and publish...

many thanks sir

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