No this does NOT work on aluminum.
See picture....

It looks to me that the chrome and copper plating were unevenly plated. In areas where the plating was thinnest the acid reached down to the aluminum way before the plating had dissolved elsewhere. And those areas of aluminum became food for the acid. I wasn't sure how aluminum would react. Have seen good results on steel before but now i know aluminum reacts badly to this kind of acid.  

On the bright side there’s nothing mechanically wrong with the clamp. I’m gonna own my mistake and put the header-clamp-of-shame back on my bike. It doesn’t look any worse than my crankcases after the past couple harsh winters. And I got that nasty cloudy chrome off. Couldn’t stand looking at that.

Anyway for the future don’t use this dechroming method on anything but steel parts. Works like a charm on steel.

From the distance it isn't so bad though....