In absorption chillers using LiBr aqueous solution, corrosion problems of carbon steel heat exchangers become more serious as the temperature of the generator increases. To reduce the corrosion problems, various surface treatment methods are applied such as a shot-peening. In this study, corrosion characteristics were investigated for untreated and shot-peened surfaces. Pyrex tube samples containing the specimens and LiBr aqueous solution with Li₂MoO₄ were made and put into a high temperature oven at 200 °C After 2000 hours, the surface and cross section of carbon steel specimens were observed using field emission scanning electron microscope (FE-SEM) and energy dispersive spectroscopy (EDS). It was found that the passive films have the characteristic of a double layer consisting of a thick MoO₂ layer and thin Fe₃O₄ layer. Thicker passive films were observed on the shot-peened surface than the untreated one. As a result of corrosion depth measurement, the shot-peened specimens showed a slightly smaller uniform corrosion depth, however, they showed a much smaller pitting corrosion depth than the untreated ones. It is supposed that the shot-peened surface is more effective in preventing the pitting corrosion than uniform corrosion. The results of this study are expected to be applied effectively to the absorption chillers using LiBr aqueous solution to estimate and reduce the corrosion.

在使用溴化锂水溶液的吸收式制冷机中，随着发电机温度的升高，碳钢热交换器的腐蚀问题变得更加严重。为了减少腐蚀问题，应用了各种表面处理方法，例如喷丸处理。在这项研究中，研究了未经处理和喷丸处理的表面的腐蚀特性。含标本和含Li ₂ MoO _4的LiBr水溶液的Pyrex管样品制备并放入200°C的高温烘箱中。2000小时后，使用场发射扫描电子显微镜（FE-SEM）和能量色散光谱（EDS）观察碳钢样品的表面和横截面。发现无源膜具有由厚的MoO ₂层和薄的Fe ₃ O ₄组成的双层的特性。层。在喷丸表面上观察到的钝化膜比未处理的钝化膜厚。测量腐蚀深度后，喷丸试样的均匀腐蚀深度要小一些，但点蚀深度要比未处理的小得多。认为喷丸处理的表面比均匀腐蚀更有效地防止点蚀。预期该研究的结果将有效地应用于使用LiBr水溶液的吸收式制冷机，以估计并减少腐蚀。