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08410 Hindrance of Hydrogen Effusion from Steel by Coatings and Layers

Picture for 08410 Hindrance of Hydrogen Effusion from Steel by Coatings and Layers
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Product Number: 51300-08410-SG
ISBN: 08410 2008 CP
Author: Guenter Schmitt and Kang Ma
Publication Date: 2008
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The likelihood of hydrogen induced materials damages depends on the rate of hydrogen upmke, the hydrogen concentration in the material, the susceptibility of the material to hydrogen induced cracking (without and with stress) and finally the rate of hydrogen effusion from the material. The latter effect has been subject to previous investigations III and it was shown that films of organic compounds can hinder as well as stimulate the hydrogen effusion from steel. This paper now reports on the effect of metal coatings (electrochemically plated palladium, copper, nickel and zinc, chemically (electroless) deposited Ni-P3, Ni-P12 and Ni-Sn2-P9) on hydrogen effusion from X65 pipeline steel membranes. A hindrance factor was defined for the first time and normalized to a reference coating thickness in order to quantify the effect of specific types of metal coatings on the hydrogen desorption rate from steel.
The likelihood of hydrogen induced materials damages depends on the rate of hydrogen upmke, the hydrogen concentration in the material, the susceptibility of the material to hydrogen induced cracking (without and with stress) and finally the rate of hydrogen effusion from the material. The latter effect has been subject to previous investigations III and it was shown that films of organic compounds can hinder as well as stimulate the hydrogen effusion from steel. This paper now reports on the effect of metal coatings (electrochemically plated palladium, copper, nickel and zinc, chemically (electroless) deposited Ni-P3, Ni-P12 and Ni-Sn2-P9) on hydrogen effusion from X65 pipeline steel membranes. A hindrance factor was defined for the first time and normalized to a reference coating thickness in order to quantify the effect of specific types of metal coatings on the hydrogen desorption rate from steel.
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