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耐候性鋼のさび安定化処理(RSコート)

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川崎製鉄技報 KAWASAKI STEEL GIHO

Vol.16 (1984) No.2

耐候性鋼のさび安定化処理(RS コート)

Rust Stabilizing Surface Treatment for Atmospheric Corrosion Resistant Steel (RS-COAT)

今津 司(Tsukasa Imazu) 栗栖 孝雄(Takao Kurisu) 中井 揚一(Yoichi Nakai) 久 野 忠一(Tadakazu Kyuno) 石渡 正夫(Masao Ishiwata) 佐藤 忠明(Tadaaki Sato) 要旨 : 構造物のメンテナンスフリーの面から耐候性鋼の無塗装使用が注目されているが,裸使用 では初期の流出さび汁による周囲の汚染や一様に安定さびができるまでの外観不良が問題 とされることがある。そこで初期さび汁の流出を防止し,かつ,安定化に至るまでの外観を 改良しつつ安定さびを形成させるさび安定化処理「RS コート」を開発した。RS コートは, さび生成に必要な水,酸素を適度に鋼面へ供給し,流出さびを抑制した。鋼面では安定さび 層が形成されていた。また,RS コートは,海塩粒子などの腐食性物質のバリヤとしての機 能も兼ね備えていた。裸使用の場合よりも安定さびの形成は遅れるが,裸使用の際の問題を 解決した安価なさび安定化処理である。 Synopsis :

It is well-known that atmospheric corrosion resistant steel give beautiful rust appearance, which has been formed during long period exposure. In initial exposure, however, its rust sometimes pollutes surrounding structures, flys itself in all directions and gives uneven appearance. RS-COAT has been developed to improve the above-mentioned weak points for the purpose of increasing the maintenance-free period of atmospheric corrosion resistant steel. On the basis of the investigation by coating and long period exposure tests, it is found that RS-COAT has the following beneficial characteristics. (1) Controlling corrosion rate at a low level as a result of moderately supplying such corrosive agents as O2 or H2O to steel surface. (2) Preventing the out flow of Fe ion. (3) Keeping a fairly good appearance until the rust has been stabilized. (4) Acting as barrier and trapping layer against such corrosive agents as Cl or SOx. (5) Economical one coating process. RS-COAT has successfully been used for such structures as roofs, bridges and walls.

(c)JFE Steel Corporation, 2003

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