This is a good ref.
These excerpts are from the MTI MS-3 on HCl.
After reading these you will see why there is so much information on SS and Ni alloys in HCl, they are really the only options.
+Aluminum and Aluminum-Based Alloys
Neither aluminum nor any aluminum-based alloys are resistant to any concentration of
hydrochloric acid.
+Iron and Steel
Neither cast iron nor carbon steel is resistant to hydrochloric acid, even dilute concentrations
(<pH 4).
+Copper and Copper-Based Alloys
There are three basic problems with applications of copper and copper-based alloys in
hydrochloric acid:
-High-zinc yellow brasses suffer selective corrosion, i.e., dezincification.
-Dissolved oxygen (DO) or oxidizing contaminants (e.g., Fe+++) cause accelerated
attack.
-Corrosion products of copper are themselves oxidizing agents, cupric ions, so the
attack is autocatalytic if Cu++ can accumulate (as in a recycle stream).
Silicon bronzes such as UNS C64900 (1% Si) and C65500 (3% Si) have slightly better
resistance than other copper-based alloys because of formation of a siliceous film.
Among metals Ta and Pt are the only two that have very high corrosion resistance to hot acid.
There are many non-metallics that work very well in HCl.
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Plymouth Tube
