This study evaluates environmental aggressiveness and atmospheric galvanic corrosivity categories in Chile (Classification of Industrial and Marine ATmospheres test) by installing bolts in electrical transmission towers in the Valparaiso region across four exposure sites: Playa Ancha, San Sebastián, Las Vegas, and San Felipe. Classifications of marine corrosion index (MCI), industrial corrosion index (ICI), and atmospheric corrosion index (ACI) used different galvanic couples: aluminum/steel for MCI, aluminum/copper for ICI, and aluminum/polyethylene for ACI. Corrosion indices varied by season (summer, autumn, winter, and spring), for which couples were exchanged every 3 months. Intraseason variation depended mainly on the meteorochemical variables of the zone, the Cl⁻/SO₂ ratio, and the presence of general and pitting corrosion in the aluminum. The results indicate that, regardless of environmental condition, the aluminum in Al/steel (MCI) and Al/copper (ICI) couples presented a higher corrosion rate than when not forming a galvanic couple (ACI). Moreover, under higher environmental chloride, these differences increase. The Playa Ancha station presented the highest ACI.

中文翻译：

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评估智利瓦尔帕莱索地区不同地点输电塔中的大气电铝腐蚀。螺栓固定测试 (CLIMAT)

本研究通过在瓦尔帕莱索地区四个暴露地点的输电塔中安装螺栓来评估智利的环境侵袭性和大气电偶腐蚀性类别（工业和海洋大气测试分类）：Playa Ancha、San Sebastián、Las Vegas 和 San Felipe。海洋腐蚀指数 (MCI)、工业腐蚀指数 (ICI) 和大气腐蚀指数 (ACI) 的分类使用不同的电偶：MCI 为铝/钢，ICI 为铝/铜，ACI 为铝/聚乙烯。腐蚀指数因季节（夏、秋、冬、春）而异，每三个月更换一次。季内变化主要取决于区域的气象化学变量，Cl ^- /SO ₂比，以及在铝中存在一般腐蚀和点蚀。结果表明，无论环境条件如何，铝/钢 (MCI) 和铝/铜 (ICI) 对中的铝比未形成电偶 (ACI) 时的腐蚀速率更高。此外，在较高的环境氯化物下，这些差异会增加。Playa Ancha 站的 ACI 最高。