ABSTRACT

The Wet Candle technique quantifies the dry deposition flux of atmospheric species onto a gauze wick. Salt deposition flux is used to rate the corrosion severity of outdoor test sites. It is important to quantify the precision of the Wet Candle method if the results are used to compare the atmospheric corrosivity of various sites. An analysis of Wet Candle precision is conducted in terms of repeatability and reproducibility. The percent deviation is 3.2% for chloride repeatability and 3.3% for chloride reproducibility. Interval testing is conducted to determine if weekly intervals added together yield a deposition flux similar to a month-long interval. Weekly results are assessed alongside meteorological data to correlate atmospheric conditions to dry deposition. Finally, the erroneous contribution of chloride from various types of gloves to deposition flux is quantified. Based on these findings, recommendations are made on how to avoid various sources of error.

摘要

湿蜡烛技术量化了大气物质在纱布芯上的干沉积通量。盐沉积通量用于评估室外试验场地的腐蚀严重程度。如果将结果用于比较不同地点的大气腐蚀性，量化湿烛法的精度很重要。根据可重复性和再现性对湿蜡烛精度进行分析。氯化物重现性的百分比偏差为 3.2%，氯化物重现性的百分比偏差为 3.3%。进行间隔测试以确定每周间隔加在一起是否产生类似于一个月间隔的沉积通量。每周结果与气象数据一起评估，以将大气条件与干沉降联系起来。最后，量化了来自各种类型手套的氯化物对沉积通量的错误贡献。根据这些发现，就如何避免各种错误来源提出建议。