This paper describes comparative tests for hydrogen susceptibility on bare wire, galvanized wire and redrawn galvanized wire used for prestressed concrete. Specimens were immersed in NH 4SCN solution, and then the relative susceptibility for hydrogen embrittlement was evaluated by changing the mechanical properties. Microstructures are presented as a further aid in evaluating embrittlement. Hydrogen absorption was measured and hydrogen migration was studied with an optical microscope. Crystal lattices were applied as basis of theory of zinc's inhibiting nature to hydrogen embrittlement.
