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建材用ステンレス鋼の腐食挙動と評価方法

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川崎製鉄技報

KAWASAKI STEEL GIHO Vol.30 (1998) No.2

建材用ステンレス鋼の腐食挙動と評価方法

Atmospheric Corrosion Behavior of Stainless Steels for Buildings and its Estimation Method

栃 原 美 佐 子(Misako Tochihara) 宇城 工(Takumi Ujiro) 佐藤 進(Susumu Satoh) 要旨 : ステンレス鋼を建材に使用した場合の腐食挙動を詳しく調べるために,全国各地での大気 暴露調査に加えて,実建築物での発銹調査と『屋根と軒をシミュレートした架台』を用い た大気暴露試験を行った。この結果から,全国各地での暴露結果は海塩粒子量とよく対応 すること,建築物においては軒部は屋根部に比べて発銹しやすく,軒部においては軒角度 が急であるほどその傾向が強いことを確認した。屋根および軒部の付着物中の塩化物イオ ン量の分析をすると,軒部は屋根部に比べて付着塩化物イオン量が多く,軒部においては 軒角度が急であるほど付着塩化物イオン量が多い。さらに屋根部と発銹が目立った軒部 (60。) について,湿度の 1 日の経時変化を測定すると,軒部はステンレス鋼が発銹しやす いと言われる相対湿度 33~75% の範囲にある時間が屋根部に比べて長いことがわかった。 Synopsis :

Atmospheric corrosion behavior of stainless steels applied to buildings has been studied through atmospheric corrosion tests, inspection of actual buildings and an exposure test of building-simulating stand. Results are, as follows: (1) The corrosion of the stainless steels corresponded to the amount of chloride ion in atmospheric dust on the specimens, (2) Stainless steels used for eaves corroded more severely than those for the roofs, (3) The steeper the eaves ユ angle, the more the stainless steel corroded, (4) The amount of chloride was found to be larger on the eaves than on the roofs and increased as the angle of the eaves increased, (5) The humidity on the eaves remained at 33 to 75% for a long time in a day. The humidity (RH33 to 75%) on the eaves accelerates the atmospheric corrosion.

(c)JFE Steel Corporation, 2003

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