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                  polarization intensifies the formation of secondary structures and increases wear.

                  The coefficient of friction decreases insignificant. It was shown for the first time

                  that  the  frictional  interaction  under  anodic  polarization  initiates  the  shift  of  the

                  pitting  potentials  of  the  08H18H10T  alloy  towards  the  corrosion  potential.  It  is

                  established that the parameters of fine crystalline structure, phase composition and

                  micromechanical properties of surface layers of metals change due to electrolytic

                  hydrogenation, which determine their tribological behavior and wear mechanisms:

                               It is shown that the concentration of residual hydrogen in the surface

                  layer of armco  iron  increases  from 3  to 16 ppm  with  increasing current density

                  from 0.5 to 2 A/dm . It causes embrittlement and destruction of the friction surface
                  by the dispersion mechanism. Therefore, in the conditions of dry friction, the wear

                  of pre-hydrogenated iron-armko increases by 40…60%, and in the case of friction

                  with simultaneous hydrogenation - by 10%.

                                hydrogenation of aluminum and copper does not cause a significant

                  change  in  their  tribotechnical  characteristics.  Copper  and  aluminum  are

                  characterized by oxidative wear, which is insensitive to hydrogen.
                                titanium  interacts  with  hydrogen  and  brittle  hydride  phases  are

                  formed , which reduce the wear resistance of the metal both after hydrogenation

                  and  in  its  process.  The  friction  force  during  the  scratch  tests  is  reduced  by  ~  3

                  times, and the material losses increase by 30-50%.
                                hydrogenation of niobium to a concentration of  more than 10 at. %

                  leads to the strengthening of the surface layer and, accordingly, increase its wear

                  resistance by ~ 4 times.

                                hydrogenation of zirconium to a concentration of ~ 5 at. % reduces its

                  wear resistance by 20….40%. In the presence of hydrogen in the surface layers, a

                  hydride phase is formed, which serves as a solid lubricant and increases the wear

                  resistance of zirconium both after and during the hydrogenation process.

                         It  was  found  that  galvanic  composite  coatings  Ni-P  and  Ni-B  after  heat

                  treatment reduce wear of steel 17Mn1Si in 2-5 times in a hydrogen environment

                  and  wear  of  aluminum  alloy  Д16T  in  a  chloride-containing  environment  in  ~  7
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