In (I think) the first edition of Zumdahl's chemistry textbook, there was a great summary of some of the things they had to do to preserve the statue, and it went beyond just repairing the skin.
The wiki article (https://en.wikipedia.org/wiki/Conservation-restoration_of_th...) has a lot of it, but IIRC after they installed stainless steel, at some point they passed electricity through it, which had the effect of making it susceptible to corrosion, and then had to do something else to restore its resistance.
I wish I could find it now, as it was a fascinating read, but I can't see anything easily online.
The wiki article (https://en.wikipedia.org/wiki/Conservation-restoration_of_th...) has a lot of it, but IIRC after they installed stainless steel, at some point they passed electricity through it, which had the effect of making it susceptible to corrosion, and then had to do something else to restore its resistance.
I wish I could find it now, as it was a fascinating read, but I can't see anything easily online.