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■■■■■■■■■■■■■■■■■■■ 川崎製鉄技報 KAWASAKI STEEL GIHO Vol.2 (1970) No.2 ■■■■■■■■■■■■■■■■■■■ |
| 耐候性鋼の塗装性について Durability of Paint on Atmospheric Corrosion Resistant Low Alloy Steels 中山 雅道(Yoshimichi Nakayama) |
| 要旨 ： 耐候性構造用鋼材の塗装性について調べるため塗装鋼板の暴露試験および実橋での塗装性試験を行ない３年後（実橋試験では1.5年後）の暴露試験結果から次のような知見を得た。(1)塗装系は従来のものが適用でき，耐候性鋼の使用によって塗替周期の延長が可能であるが，塗膜寿命に対する寄与は鋼種の差より素地調整法による差の方が大きい。(2)耐候性鋼は普通鋼に比べてフクレサビの発生度では差がないがスクラッチからのクリープ幅ではかりすぐれている。またサビについてはわずかながら普通鋼より良いようである。(3)防錆効果に対するショップコート方式とフィールドコート方式の差は鋼種による差よりも大きく，ショップコート方式の方が良い。(4)実橋での塗装性試験は試験期間が短いため，鋼種および塗装仕様による差異は認められていない。 |
| Synopsis : From the tests conducted on the painted atmospheric corrosion resistant low alloy steels, it was confirmed that, when they were painted by the same painting system as was commonly applied to ordinary steels, the film of the paint showed a somewhat longer life than in the case of ordinary carbon steels. However, not so much difference as expected could be discerned in the durability of paint, at least from the test result of outdoor exposure up to four years. It is suggested, therefore, that even if the steel itself is heightened in its resistivity against atmospheric corrosion, it does not necessarily lead to simplification in the painting system for the atmospheric corrosion resistant steels. On the other hand, the tests of 1-year outdoor exposure of bare steels showed that both the atmospheric corrosion resistant low alloy steel and the high tensile low alloy steel were found less corroded, and this tendency agreed with that of the corrosion which occurred to the damaged parts of the painted specimen. This fact implies that atmospheric corrosion resistant low alloy steels are suited for use in the steel structures that must stand severe environment and, moreover, cannot be frequently repainted except only at long intervals. It was also noted from other factors that (1) shop-coat system gave excellent results on anticorrosiveness and (2) the reverse side of specimen rusted somewhat more easily than the surface. |
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