noun-modifying (irregular)
corrosion-resistant
Used as a prenominal modifier in technical contexts, often in compound nouns like 耐食合金 (corrosion-resistant alloy).
このパイプは耐食合金で作られている。
This pipe is made of a corrosion-resistant alloy.
耐食性 is a noun meaning 'corrosion resistance' (the property), while 耐食 is a prenominal modifier meaning 'corrosion-resistant'.
Compound of 耐 (resistance) and 食 (eating/corrosion), referring to resistance to chemical or environmental degradation.