CORROSION INHIBITOR AND CORROSION INHIBITION METHOD

• Main Authors: YOSHIKAWA TAKASHI, NAGAI NAOHIRO
• Format: Patent
• Language: English; Japanese
• Published: 23.05.2019
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25; NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE

To provide a corrosion inhibitor and a corrosion inhibition method that can inhibit corrosion of both a copper-based member and an iron-based member without adsorbing excessive long-chain aliphatic amine on the copper-based member in anticorrosion treatment of a cooling water system by using a long-chain aliphatic amine.SOLUTION: The corrosion inhibitor includes a long-chain aliphatic amine, an anticorrosive agent for an azole-based copper and a low-molecular-weight polymer. The corrosion inhibition method comprises adding a long-chain aliphatic amine, an anticorrosive agent for an azole-based copper and a low-molecular-weight polymer to a cooling water system. The long-chain aliphatic amine forms an anticorrosive film on the surface of an iron-based member. The low-molecular-weight polymer prevents the long-chain aliphatic amine from being excessively adsorbed on a copper-based member. The anticorrosive agent for an azole-based copper prevents corrosion of a copper-based member.SELECTED DRAWING: None 【課題】長鎖脂肪族アミンを用いた冷却水系の防食処理において、銅系部材に過剰な長鎖脂肪族アミンを吸着させることなく、銅系部材と鉄系部材の腐食を共に抑制することができる腐食防止剤及び腐食防止方法を提供する。【解決手段】長鎖脂肪族アミン、アゾール系銅用防食剤及び低分子量ポリマーを含む腐食防止剤。冷却水系に長鎖脂肪族アミン、アゾール系銅用防食剤及び低分子量ポリマーを添加する腐食防止方法。長鎖脂肪族アミンにより鉄系部材の表面に防食皮膜を形成する。低分子量ポリマーにより、長鎖脂肪族系アミンの銅系部材に対する過剰吸着を防止する。アゾール系銅用防食剤により、銅系部材を防食する。【選択図】なし