The effect of Zn coating layers on the hydrogen embrittlement of hot-dip galvanized twinning-induced plasticity steel

摘要

The effect of Zn coating layers on hydrogen embrittlement (HE) was investigated using hot-dip galvanized (HDG) twinning-induced plasticity (TWIP) steel. The Zn coating layers consisted of an eta-Zn layer and Fe-Zn intermetallic layers of zeta and delta without Gamma. H was trapped particularly at the zeta layer without Zn-H compounds. The activation energies of H desorption from the delta and zeta layers were 60.0 kJ mol(-1) and 75.4kJmol(-1), respectively. The H-charged HDG_TWIP steel did not reveal HE due to the intermetallic layers, which are exceptionally brittle even when H is not enriched. (C) 2016 Elsevier Ltd. All rights reserved.