Neat! I have not tried this home version but I have worked in two professional electroplating shops. Such shops often do this cleaning under the name of "electropolishing" usually starting from fairly clean parts to begin with but this is a neat way to derust parts. Other than to compliment you on getting this to work I can only say to take the warning about hydrogen as an explosion hazard seriously and make sure you have plenty of ventilation. A lot of folks born after 1945 did not see that film reel of the Hindenberg as us geezers did. Just as you will never forget the 9/11 pictures of the towers collapsing, older folks will never forget the Hindenberg fire. I just saw a film clip of a BMW using liquid hdrogen fuel and a fire test of a fuel tank which was very impressive. However I think the real danger in using hydrogen fuel whether gas or liquid is at fill-up time. Although there are only a few accidents each year with gasoline fill-ups, those accidents would be huge explosions if hydrogen was involved. Maybe they will find a way to make it safe most of the time, but seeing a lot of foolish things people do with gasoline does not make me optimistic about John-Q-Average filling up his BMW with liquid hydrogen. Well electrolysis looks to be less destructiuve than using an acid dip so use it but with plenty of ventilation.

Don Shillady
Retired Chemist/teen rodder