Purpose

The purpose of this study was to investigate the corrosion of low molecular organic acids from water-steam cycles such as acetic acid and formic acid in mental parts of steam turbine initial condensation zone.

Design/methodology/approach

The corrosion behavior of gray cast iron in initial condensate containing different concentrations of acetic acid and formic acid was studied by weight loss test, scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction.

Findings

The results indicated that gray cast iron had a certain degree of corrosion in the simulated initial condensate containing acetic acid and formic acid, but the acid corrosion of gray cast iron was not only caused by low molecular organic acid but also affected by inorganic anions such as Cl⁻. When Cl⁻ existed, after removing corrosion products, surface analysis results proved that the surface of gray cast iron was rough and uneven with many cracks, which was corrected more serious.

Originality/value

The corrosion behavior of thermal equipment by low molecular organic acids and inorganic anions in water-steam cycles was studied. The research results can provide theoretical guidelines for corrosion control of steam turbine in power plants.

中文翻译：

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汽轮机初始凝结区低分子有机酸的腐蚀研究

目的

这项研究的目的是研究汽轮机初始冷凝区的水蒸气循环中低分子有机酸（如乙酸和甲酸）的腐蚀。

设计/方法/方法

通过失重试验，扫描电子显微镜，能谱和X射线衍射研究了灰铸铁在含不同浓度乙酸和甲酸的初始冷凝物中的腐蚀行为。

发现

结果表明，灰铸铁在模拟的含乙酸和甲酸的初始冷凝液中有一定程度的腐蚀，但灰铸铁的酸腐蚀不仅是由低分子有机酸引起的，而且还受到无机阴离子如氯^- 。当氯^-存在，除去腐蚀产物后，表面分析结果表明，灰铸铁的表面是粗糙不平有许多裂缝，这已得到纠正更严重。

创意/价值

研究了低分子有机酸和无机阴离子在水蒸汽循环中对热力设备的腐蚀行为。研究结果可为电厂汽轮机的腐蚀控制提供理论指导。