부식방지제

부식방지제는 수계 유체 내에서 금속 부품 및 설비의 전기화학적 부식을 늦추는 첨가제입니다. In industrial manufacturing they split by the metal they protect: azole film-formers such as benzotriazole guard copper, brass, and other yellow metals, while anodic inhibitors such as sodium nitrite and sodium molybdate passivate ferrous surfaces. A mixed-metal system u2014 a cast-iron machine wetted with brass fittings u2014 usually needs both a yellow-metal azole and a ferrous inhibitor, because each protects metals the other does not.

Benzotriazole (BTA) is the standard yellow-metal inhibitor. It forms a thin, insoluble complex on copper and brass that blocks the corrosion reaction, and it stays effective at low dose, often a fraction of a percent of the fluid. Specify BTA wherever a metalworking fluid, coolant, or cleaner contacts copper alloys. It does little for bare steel, so it complements rather than replaces a ferrous inhibitor.

For ferrous protection the choice is between sodium nitrite and sodium molybdate, and that is the real trade-off on this page. Sodium nitrite is a strong, low-cost anodic inhibitor, but it is not used in fluids containing secondary amines, because the two can react to form N-nitrosamines; many modern water-soluble metalworking fluids use sodium molybdate or amine-carboxylate chemistry instead. Molybdate works at higher dose and cost but avoids that reaction. Confirm regulatory status for your application and jurisdiction.

• 금속가공유 및 쿨런트에서의 황색 금속(구리, 황동, 청동) 보호
• 수용성 절삭·연삭유에서의 철계 금속 부식 억제
• 폐회로 및 순환 시스템의 부식 제어
• 가공된 철계 부품의 공정 간 및 공정 중 방청
• 강과 구리 합금이 하나의 유체를 공유하는 이종 금속 계통 보호

• Benzotriazole u2014 PubChem
• Sodium molybdate u2014 PubChem
• Sodium nitrite u2014 PubChem