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二層塗装方式によるエポキシ塗装鋼管の防食性の改善

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川崎製鉄技報 KAWASAKI STEEL GIHO

Vol.17 (1985) No.2

二層塗装方式によるエポキシ塗装鋼管の防食性の改善

Improvement in Anti-Corrosive Properties Fusion-Bonded Epoxy-Coated Pipes by Double Layer Coating

向 原 文 典(Fuminori Mukaihara) 小菅 詔 雄(Norio Kosuge) 栗栖 孝雄 (Takao Kurisu) 中井 揚一(Yoichi Nakai) 美浦 一彦(Kazuhiko Miura)

要旨 : 二層コート方式による新しいエポキシ粉体塗装大径鋼管を開発した。鋼管下地処理として はクロメート処理を行い,エポキシ塗料には,吸水率の少ないフェノール系エポキシ硬化剤, ゴム変性エポキシ樹脂,および防錆顔料を採用した。下塗り塗膜に密着性と防食性,上塗り 塗膜に耐衝撃性,曲げ性等の機械的性能を持たせることにより,従来の一層塗膜では満足し きれなかった防食性と機械的性能を同時に満足できるすぐれた特性が得られた。これによ り寒冷地から熱帯地にかけての広い範囲にわたってのエポキシ塗装鋼管の使用が可能とな った。本報告では,耐衝撃性,耐温水性,耐陰極剥離性,耐針入度性について,塗装材料, 塗装条件の面から報告した。 Synopsis :

A new double-layer fusion bonded epoxy powder coating on large diameter pipe has been developed. The new coating system consists of chromate treatment as chemical treatment of the blasted surface of steel, a double-layer coating which contains bisphenol A type epoxy resin and phenol derivatives as a hardener, which has low water absorption, and rubber-modified epoxy resin and anticorrosive pigments. The lower coating layer has good adhesion and anticorrosion properties, i.e., hot water resistance, and cathodic peeling resistance. The upper coating layer has good mechanical properties, i.e., impact resistance, bendability and penetration. As a result, the new coated pipe has both good anticorrosive and mechanical properties, which no conventional one-layer coated pipe can have. This paper discusses impact resistance, hot water resistance, cathodic peeling resistance and penetration resistance of the new coating.

(c)JFE Steel Corporation, 2003

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