Abstract
FOR a long time it has been well known to wire-drawers and other manufacturers, who free the iron or steel they are engaged in working from rust by cleaning it with sulphuric acid, that after this process the metal becomes much more brittle than before. Further, if a piece of iron wire that has been cleaned in sulphuric acid be bent rapidly to and fro till it is broken, and the fracture be then moistened with the tongue, bubbles of gas arise from it, causing it to froth. If this same wire be now gently heated for a few hours, or left in a dry warm room for some days, it will be found to have regained its original toughness, and not to froth when broken and the fracture moistened.
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JOHNSON, W. On Some Remarkable Changes Produced in Iron and Steel by the Action of Hydrogen and Acids . Nature 11, 393 (1875). https://doi.org/10.1038/011393a0
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DOI: https://doi.org/10.1038/011393a0
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