The automotive industry uses different kinds of steel fasteners (bolts and screws) that are prone to catastrophic failure as a consequence of hydrogen absorption. Permeation, plating, and baking tests were carried out to determine the susceptibility of a newly developed steel (BHS-1) to absorb and diffuse hydrogen in comparison to the currently used type 1022 (UNS G10220) and type 4037 (UNS G40370) steels. The effective diffusion coefficient Deff for BHS-1 was slightly lower (8x10-8cm2.s-1) than for traditional steels such as types 1022 and 4037 (3x10-7cm2.s-1. BHS-1 steel presented more sites for hydrogen trapping than the traditional steels. A similar amount of hydrogen was introduced into the steels during acidic and alkaline industrial zinc-plating processes. A similar amount of hydrogen in dissolved in all the steels studied. A baking treatment for 8 h removed only approx. 30 % of the hydrogen introduced during the zinc-plating process.
Hydrogen diffusion and accumulation in automotive fasteners
Wasserstoffdiffusion und -akkumulation in Befestigungselementen der Automobilindustrie
Corrosion, Houston ; 53 , 6 ; 481-488
1997
8 Seiten, 10 Bilder, 4 Tabellen, 26 Quellen
Article (Journal)
English
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