The only thing that is going to "change" the metal is the amount of rust involved. In the late 80's I had a WWII K Bar in my shop that had been found in the Philippines by a customer. After soaking it a few days and a rinse I could see that the majority of the knife had been eaten away by rust. I had to rebuild the edge and tang but the customer and I decided to leave the webbing pattern in the center of the blade as a design feature, it looked like the veins of a leaf, really cool. So, no, it won't change the molecular structure of the razor but it will remove the rust. The rest is up to you.