✍ Scribed by D.J Van Ooijen; J.D Fast
No coin nor oath required. For personal study only.
Pure iron wires were supersaturated with hydrogen by cathodic charging in sulphuric acid. It was found that the hydrogen precipitates at the crystal boundaries, building up high gas pressures. Microscopic cracks are thus formed, accompanied by cold working of the surrounding metal.
An increase of the electrical resistance of the wires due to the cracks and an increase due to coldworking, could be measured as two distinctly different effects. No change in the resistance due to interstitial solution of hydrogen could be detected.
ELECTRIQUE DE FILS DE PER CHARGE D'HYDROGENE Des fils de fer pur Btaient surcharges d'hydrogene par Blectrolyse dans l'acide sulfurique. On a constate que l'hydrogene precipite aux joints de grains, developpant ainsi des hautes pressions. Des fissures microscopiques sont formees, ce qui est accompagne d'un Bcrouissage du metal environnant. Une augmentation de la resistance Blectrique des fils par suite de ces fissures et une augmentation par suite de l'ecrouissage, pouvaient Btre mesurees comme deux effets differents. On ne constatait aucun changement de la resistance, qui pourrait 6tre attribue a la presence d'atomes d'hydrogene en insertion dans le metal. ELEKTRISCHER WIDERSTAND WASSERSTOFFBELADENER EISENDRAHTE Reine Eisendrlihte wurden durch kathodische Beladung in Schwefelsiiure mit Wasserstoff iibersattigt. Es wurde festgestellt, dass der Wasserstoff sich an den Korngrenzen ausscheidet und dort hohe Gasdrticke aufbaut. Dadurch werden nicht nur mikroskopische Risse geformt, sondern das umgebende Eisen wird such plastisch deformiert. Eine Zunahme des elektrischen Widerstandes der Drahte infolge der Risse und eine Zunahme infolge der Kaltverformung konnten als zwei durchaus verschiedene Effekte gemessen werden. Eine Widerstandsanderung, welche Wasserstoff in interstitieller Losung zuzuschreiben ware, konnte nicht festgestellt werden.
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