Effect of Saccharin on Protective Ability of Co–Cr–W Electrolytic Coatings

Issue 2(88) 2018
Pages 35-40

V.V. Kuznetsov, Dmitry Mendeleev University of Chemical Technology (MUCTR), Moscow,
Russian Federation

S.S. Kruglikov, MUCTR, Moscow, Russian Federation

A.V. Telezhkina, MUCTR, Moscow, Russian Federation

E.A. Filatova, MUCTR, Russian Federation

M.M. Aminov,  MUCTR, Moscow, Russian Federation

N.G. Novikova, Institute of Comprehensive Exploitation of Mineral Resources, RAS, Moscow, Russian Federation


Keywords: protective ability, saccharin, corrosion resistance, electroplating, porosity, internal stresses, electroplating of iron-group metals

https://doi.org/10.31615/j.corros.prot.2018.88.2-5

 

Saccharin (0.5…2 g/L) was added into water-DMF solution used for Co–Cr–W protective coatings electrodeposition in order to reduce internal stresses in the deposits. This led to the decrease in porosity and to the corresponding increase in the protective ability of coatings under conditions of acid salt spray chamber. Apparently, this effect is associated with decrease in the number of through pores and cracks in the coatings.