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Investigation of Corrosion Damages caused by Air Pollutans in Western Japan and Those Countermeasures.

日本西部大气污染物腐蚀损害调查及对策.

基本信息

批准号：
09650791
负责人：
KUMADA Makoto
金额：
$ 2.3万
依托单位：
Yamaguchi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650791/
关键词：
Acid Rain Corrosion Damages Air Pollutants pH Carbon Steel Rust UV Irradiation Photocatalystic Effect

项目摘要

(1) We investigated acid rain corrosion damages of structures and cultural assets, and forest decline in western Japan which has became a serious problem. It has been found a damage of cultural assets that gold plated HAKKAKU TORO made of copper in DAIBUTSUDEN OF NARA-TODAIJI was corroded by chlorinic species due to pollution combustion and by acid rain due to sulfuric oxides. A great number of dead pine trees have been found along high ways in Okayama, Hiroshima and Yamaguchi Prefectures. Prof. Nakane of Hiroshima University proposes an thought that acid falls adherent to pine leaves and air pollutants solved into fog and dew drops decrease the function of photosynthesis and that declined pine trees are easily attacked by a few harmful insects.(2) We measured pH values of rain at several points in Yamaguchi Prefecture. pH values were 4.38 to 6.25 at Faculty of Engineering of Yamaguchi University, 4.72 at a point in Shyuho Town and 4.38 to 5.79 at a point in Heki Town. Acidification of rain was remarkable in Heki Town near Japan Sea.(3) We investigated the photocatalystic effect of rust on acid rain corrosion of a carbon steel. Ultra-Violet(UV) light was irradiated to the carbon steel in artificial acid rain. Corrosion loss of the rusted carbon steel increased 20 to 40% due to UV irradiation and the photocatalystic effect of rust on corrosion became larger with immersion time. Electrochemical anodic polarization curves confirmed the photocatalystic effect of rust. Porarization to 0 mV induced 0.3 mA/? of light response current density. From the results, we proposed a enhacement mechanism of the photocatalystic effect of rust on acid rain corrosion of a carbon steel.

(1)我们调查了酸雨对建筑物和文化资产的腐蚀损害，以及日本西部森林的衰退，这已经成为一个严重的问题。在奈良东大寺大佛电用铜制作的镀金白角TORO被污染燃烧产生的氯类物质和硫酸氧化物产生的酸雨腐蚀，造成了文化财产的破坏。在冈山、广岛和山口县的沿着高速公路沿线发现了大量死亡的松树。广岛大学的中根教授提出了一种观点，即附着在松树叶片上的酸福尔斯和溶解成雾和露珠的空气污染物降低了光合作用的功能，并且衰退的松树很容易受到一些有害昆虫的攻击。(2)我们在山口县的几个地点测量了雨水的pH值。山口大学工学部的pH值为4.38至6.25，瑞穗町的pH值为4.72，Heki町的pH值为4.38至5.79。在日本海附近的Heki町，雨水的酸化非常显著。(3)研究了铁锈对碳钢酸雨腐蚀的光催化作用。采用紫外线（UV）照射模拟酸雨中的碳钢。锈蚀碳钢在紫外光照射下的腐蚀损失增加了20 ~ 40%，锈蚀对腐蚀的光催化作用随浸泡时间的延长而增大。电化学阳极极化曲线证实了铁锈的光催化作用。0.3 mA/？诱导的0 mV的孔化光响应电流密度。根据实验结果，提出了铁锈光催化增强碳钢酸雨腐蚀的机理。