The  tribocorrosion  behavior  as  well  as  the  corrosion-wear  interaction  of  Monel  400  alloy  in  seawater  were 
investigated under varied loads. An abnormal antagonistic effect of corrosion on wear was found, which was 
highly related to the peculiar corrosion products in the shape of nanospheres only generated under the tribo-
corrosion condition due to the selective corrosion of Ni-rich components. A boundary lubrication layer, con-
sisting of the nanospheres squeezed and spread by friction stress, leaded to the reduction of friction coefficient. 
Moreover, the material loss rate was greatly alleviated because the friction-induced surface delamination and 
sub-surface crack propagation were prevented.