RT Journal Article SR Electronic A1 El-Amoush, Amjad Saleh T1 Hardness Variations on a Hydrogenated Tin Brass Heat Exchanger JF Acta Mechanica Slovaca YR 2012 VO 16 IS 4 SP 56 OP 62 DO 10.21496/ams.2012.041 UL https://www.actamechanica.sk/artkey/ams-201204-0008.php AB Tin brass heat exchanger tube was hydrogen charged under different cathodic charging conditions. The introduction of charged hydrogen into tin brass tube was found to induce hardening on its surface. The severity and the depth of the hardened region was observed to increase with either cathodic current density or charging time. Ageing after charging results in either complete or partial recovery of hardness, depending on the charging conditions applied to heat exchanger tube.