Corrosion
noun, する verb
When something rots and eats away at something, that is corrosion. Not a good thing.
ふしょく
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
ステンレスは腐食作用への耐久性があるんじゃなかったっけ？
Stainless steel is supposed to withstand corrosion, isn’t it?