There are multiple references to sample cleaning methods prior to hydrogen content determination, or hydrogen spectroscopy analysis, but there is still no unified criteria; different authors use their own “know-how” to perform this task. The aim of this paper is to solve, or at least clarify, this issue. In this work, the most commonly used sample cleaning methods are compared. Then, five different methodologies are applied on certified hydrogen content calibration pins and on high strength steel concrete-prestressing strands and the three main situations regarding hydrogen content in the microstructural net (non-charged, charged, and charged and uncharged) are studied. It was concluded that the HCl solution C-3.5 cleaning method recommended by ASTM G1 introduces large amounts of hydrogen in the samples; but can be useful for eliminating superficial oxides if necessary. The rest of the methods had similar results; but the more complete ones that involve ultrasounds and last longer than 8 min are not appropriated when important diffusion may occur on the samples during their application. Simple methods that involve acetone or trichloroethylene and last around 1 min are preferable for almost all situations as these are faster, easier, and cheaper. As a final recommendation, as trichloroethylene is toxic, the simple acetone method is, in general, the most convenient one for regular hydrogen content analysis.

中文翻译：

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钢中氢含量测定之前样品清洗方法的分析

在测定氢含量或进行氢谱分析之前，有很多关于样品清洁方法的参考文献，但是仍然没有统一的标准。不同的作者使用他们自己的“诀窍”来执行此任务。本文的目的是解决或至少澄清此问题。在这项工作中，比较了最常用的样品清洁方法。然后，将五种不同的方法应用于经认证的氢含量校准销和高强度钢混凝土预应力绞线上，并研究了有关微结构网中氢含量的三种主要情况（不带电，带电，带电和不带电）。结论是，ASTM G1推荐的HCl溶液C-3.5清洗方法会在样品中引入大量氢气；但在必要时可用于消除表面氧化物。其余方法具有相似的结果。但是，当样品在使用过程中可能发生重要扩散时，不适合使用涉及超声波且持续时间超过8分钟的较完整的样品。涉及丙酮或三氯乙烯并持续约1分钟的简单方法几乎在所有情况下都比较可取，因为它们更快，更容易且更便宜。作为最终建议，由于三氯乙烯具有毒性，因此简单的丙酮方法通常是常规氢含量分析中最方便的方法。涉及丙酮或三氯乙烯并持续约1分钟的简单方法几乎在所有情况下都比较可取，因为它们更快，更容易且更便宜。作为最终建议，由于三氯乙烯具有毒性，因此简单的丙酮方法通常是常规氢含量分析中最方便的方法。涉及丙酮或三氯乙烯并持续约1分钟的简单方法几乎在所有情况下都比较可取，因为它们更快，更容易且更便宜。作为最终建议，由于三氯乙烯具有毒性，因此简单的丙酮方法通常是常规氢含量分析中最方便的方法。