I'm glad to hear that you sorted things out.
Actually, titanium has excellent resistance to sulfuric acid, much better than aluminum. What you saw was what happens even to titanium when subjected to enormous current density; the 0.5A that you applied was concentrated in that skinny wire and only where it was in the electrolyte. The resulting current density in the wire could have been 100's of A/sq.ft. You didn't have a connection to the work for more than a matter of minutes before the connection anodized and failed.
It isn't the tank bar to wire connection, this isn't in the electrolyte. It's the wire to the work connection that makes trouble.
You now understand why when we say the connections must be TIGHT we aren't kidding. This isn't limited to LCD, the higher the current density you anodize at the more severe this problem becomes.
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