AVS 49th International Symposium
    Applied Surface Science Thursday Sessions
       Session AS-ThM

Paper AS-ThM11
Sorbed Water, as the Source of the Dissolved H@sub 2@ and D@sub 2@ In Metals at Friction

Thursday, November 7, 2002, 11:40 am, Room C-106

Session: Practical Surface Science I
Presenter: E.A. Deulin, Bauman Moscow State Technical University, Russia
Authors: E.A. Rodina, Bauman Moscow State Technical University, Russia
E.A. Deulin, Bauman Moscow State Technical University, Russia
Correspondent: Click to Email
Results shows, that concentration of the H@sub 2@ dissolved in the steel 304 after keeping in normal atmosphere (pressure of H@sub 2@ P@sub H2@ =5*10@super -2@ Pa, pressure of D@sub 2@ P@sub D2@=7*10@super -6@ Pa) is C@sub H2@ = 2*1019 at/sm@super 3@, instead of theoretically expected C@sub H2@ = 2*10@super 19@ at/sm@super 3@, similarly, for D@sub 2@, dissolved at P@sub D2@ = 7*10@super -6@ Pa, its concentration, instead of theoretically expected C@super theor@@sub H2@ = 8*10@super 15@ at/sm@super 3@ is C@sub D2@ = 1*10@super 18@ at/sm@super 3@. As for H@sub 2@ also as for D@sub 2@ it is possible to explain their increased concentration by the relay dissociation of sorbed water.@super 3@ The results show that the residual atmosphere of H@sub 2@ or D@sub 2@ influences on ions exchange processes of D@sub 2@ and H@sub 2@ in layers of sorbed water. So, in the submitted results it is enough 0,002% dissociation of sorbed water to ensure the pointed mentioned concentration. Concentration of the dissolved gases (N=6000 cycles, Sigma= 1500 MPa, n = 600 cont/s) grows up to C @super max@ @sub D2@ = 2*10@super 21@ at/sm@super 3@ and C@super max@ @sub D2@ = 3*10@super 19@ at/sm@super 3@ as a result of mechanical action influence that corresponds to the 8,5% dissociation of H@sub 2@O, and corresponds to 0,1% dissociation of HDO (for used in a result of D@sub 2@ interaction from a surface). @FootnoteText@ @footnote 1@ E.A. Deulin, A.A. Gatsenko, B.A. Loginov. Friction force of smooth surface of SiO2-Si02 as a function of residual pressure. Surface Science 433-435 (1999) 288-292. @footnote 2@E. A. Deulin, R.A. Nevshupa. Deuterium penetration into the bulk of a steel ball of a ball bearing due to its rotation in vacuum. Applied Surface Science 144-145 (1999) 283-286. @footnote 3@K.Akagi, M. Tsukada. Theoretical study of hydrogen relay dissociation of water molecules on Si(001) surfaces. Surface Science 438 (1999) 9-17.