>>2312397No. It's actually where parts on a production line get a 'bath' in a trough of chromium plating like automotive parts.
As
>>2312392quite rightly pointed out, most Transformers are vacuum metalized, the parts are put in a vacuum chamber and aluminum dust is released. The dust sticks to the parts giving it a fine coat of metal... But the only thing holding it on is basically friction. Repeatedly touching these parts wears the coating off.
If OP was asking about the toy in his picture, I'd wager that the parts that are the truck itself are chromed as in, actually chromed. But the parts that make up the robot mode are probably not.