noun
anti-corrosive agent; corrosion inhibitor
Technical term for a substance that prevents or slows corrosion, especially in metals.
この防食剤は鉄の錆を防ぎます。
This anti-corrosive agent prevents iron from rusting.
冷却水に防食剤を添加する。
Add a corrosion inhibitor to the cooling water.
防錆剤 specifically targets rust (錆) prevention, while 防食剤 is a broader term for corrosion protection.
Compound of 防 (prevent), 食 (corrode/eat away), and 剤 (agent/chemical).