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海洋環境における鋼材の各種防食塗装システム

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川崎製鉄技報 KAWASAKI STEEL GIHO

Vol.13 (1981) No.2

海洋環境における鋼材の各種防食塗装システム

Performance of Various Coating System for Steels in Marine Environment

久 野 忠 一(Tadakazu Kyuno) 今 津 司 (Tsukasa Imazu) 樅 山 巌 (Iwao Momiyama) 栗山 寛(Hiroshi Kuriyama)

要旨 : 海洋環境(海上大気部,飛沫帯,千満帯、海中部)において,各種防食塗装システムの 10 年にわたる暴露試験を実施した。得られた結果は次のとおりである。(1) エポキシ系は最も 優れた防食性を示した,(2) エポキシジンクリッチプライマーを用いることにより,防食性 は顕著に向上した,(3) タールエポキシ系では,素地調和が十分に行なわれた場合に膜厚の 増大とともに防食性は向上した,(4) 海上大気部以外の環境では,塗膜の劣化におよぼす鋼 種の影響は顕著に見られなかった,(5) 塗膜下のさび層には,CI の存在が確認された。こ のことから,塗装をCI が透過した可能性,および透過した CI が塗膜下腐食に大きな影響 をおよぼしていることが考えられる。 Synopsis :

Ten-year exposure tests on various protective coating systems for steels in marine environment such as atmospheric, splash, tidal and submerged zones have been conducted. The test results are as follows: (1) Epoxy coating systems showed a superior corrosion-protective performance. (2) With the use of an epoxy zinc-rich primer, coating systems showed a remarkably improved corrosion-protective performance. (3) In the case of coal-tar epoxy coating system on a steel surface prepared by thorough blast cleaning, corrosion-protective performance was improved in proportion to the increase in film thickness. (4) No remarkable influence of alloying elements in low alloy steels upon film performance was found except for the atmospheric zone. (5) EPMA analysis cofirmed that a great deal of CI existed in rust layers under the coated film. This fact may warrant the assumption that CI(-) permeated through the coated film and accelerated the corrosion reaction under the film.

(c)JFE Steel Corporation, 2003

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