This work presents an experimental study of the cold corrosion wear phenomenon that is experienced on the cylinder liners in large two-stroke marine diesel engines that burn heavy fuel oil containing sulfur. The wear is caused by condensing sulfuric acid- and water vapours (H₂SO₄ and H₂O, respectively) that are formed during combustion. In this work, cold corrosion is studied experimentally with a modified and motored light duty engine that operates at 98 revolutions per minute, in order to match the rotational speed of a large marine engine. The engine works as a tribotester where multiple charge gas compositions with up to 10% H₂O and 80 ppm H₂SO₄ (mole/mole) in dry air are fed to its cylinders to produce realistic marine engine H₂O and H₂SO₄ partial pressures. A lube oil blend that is composed by a conventional two-stroke marine engine cylinder lube oil and a base oil is used in the experiments. By extracting oil samples from the engine oil swamp during an experiment (that are analysed for iron and sulfur content using an energy dispersive X-ray fluorescence spectrometer) the cylinder liner wear rate and sulfuric acid condensation rate are determined for the applied charge gas composition and liner surface temperature (primarily 80°C). The method shows that the different charge gas compositions yield distinct liner wear rates and the highest wear rates are experienced at elevated H₂O concentrations where the influence of H₂SO₄ is comparably low.

中文翻译：

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冷凝水蒸气对船用发动机缸套冷腐蚀磨损影响的实验研究

这项工作对燃烧含硫重质燃油的大型二冲程船用柴油发动机的缸套上所经历的冷腐蚀磨损现象进行了实验研究。磨损是由燃烧过程中形成的冷凝硫酸和水蒸气（分别为 H ₂ SO ₄和 H ₂ O）引起的。在这项工作中，为了与大型船用发动机的转速相匹配，使用改进的电动轻型发动机进行冷腐蚀实验研究，该发动机以每分钟 98 转的速度运行。该发动机用作摩擦试验机，其中多种增压气体成分具有高达 10% H ₂ O 和 80 ppm H ₂ SO ₄（摩尔/摩尔）干燥空气被送入其气缸，以产生真实的船用发动机 H ₂ O 和 H ₂ SO ₄分压。实验中使用了由传统的二冲程船用发动机气缸润滑油和基础油组成的润滑油混合物。通过在实验过程中从发动机机油沼泽中提取油样（使用能量色散 X 射线荧光光谱仪分析铁和硫含量），确定所应用的增压气体成分的气缸套磨损率和硫酸冷凝率，并衬管表面温度（主要为 80°C）。该方法表明，不同的进气成分产生不同的衬里磨损率，并且在 H _{2升高时出现最高磨损率}H ₂ SO ₄的影响相对较低的O浓度。