模擬螺絲與彩色浪板結合之腐蝕行為

A Study of Corrosion Phenomenon Concerning the Simulation for Screw on Pre-Painted Corrugated Sheet

劉財喜(Liu, Tsai-Hsi) ； 王國興(Wang, Kuo-Hsing) ； 郭仲傑(Kuo, Chung-Chieh) ； 趙偉翔(Chao, Wei-Hsiang)

《高雄應用科技大學工程科技學刊》 3卷2期 (2017/12) Pp. 45-54

https://doi.org/10.6553/JKTUET.2017.0302.04

摘要

本篇報告主要是模擬建築工程的實際腐蝕狀況，觀察不同螺絲材質、施工方式、放置在不同腐蝕率大小的曝曬地點，分別為工業環境（C3腐蝕等級）、冷卻水塔旁（C3腐蝕等級）、海邊（C5腐蝕等級），對預塗裝烤漆鋼板板面起泡、銹蝕、剝落等現象進行研究追蹤觀察，三種曝曬環境差異主要為濕氣在金屬表面形成液狀薄層，結合工業區的粉塵汙染物質及水溶性無機物質，如SO_2、NO_2等，形成強腐蝕介質，加速金屬腐蝕。在冷卻水塔曝曬場環境水氣含量高且冷卻水中電導度也比空氣及雨水來的高，水中游離電子傳遞較快，是造成螺絲與鋼板伽凡尼腐蝕反應加快的主因。

關鍵字

預塗裝烤漆鋼板 ； 伽凡尼效應 ； 戶外曝曬試驗 ； 腐蝕速率

並列摘要

The main purpose of this report is to simulate actual construction situation toward different material of screw, manner of construction, and different corrosion rate location of outdoor exposure, industrial environment (corrosion C3), cooling tower aside (corrosion C3), and seaside (corrosion C5) by observing and tracking the phenomenon for blister, corrosion, peeling off on surface of pre-painted steel plates. Major difference between three exposure surroundings of outdoor is moisture forming into liquid film on the metal surface, to combine with the dust pollutants from industrial area and water soluble inorganic substance, such as SO_2, NO_2, etc., will turns into strong corrosive medium which speed up the metal corrosion. The moisture content and electrical conductivity in cooling tower is much higher than those in the air and rainwater. The reaction of Galvanic corrosion is causing speed up within screw and steel plate owing to faster transmission of free electrons in the water.

並列關鍵字

pre-painted steel plates ； galvanic effect ； outdoor exposure test ； corrosion rate