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Ключові слова: армко залізо, сталь У8, сталь 45, сірководень, сульфіди

заліза, перенапруга, корозія, наводнювання, корозійне розтріскування.

ANNOTATION

Holovei S. A. Iron sulphides influence on corrosion and hydrogenation of carbon

steels and their hydrogen sulphide corrosion cracking. – Qualification scientific work

with the manuscript copyright.

The thesis for a candidate of technical sciences degree in specialty 05.17.14

«Chemical resistance of materials and corrosion protection». – Karpenko Physico-

mechanical institute of the NAS of Ukraine, Lviv, 2018.

The thesis of establishment to solve scientific and technical problems of the

relationship between the rate of oxidation-reduction reactions and steels

hydrogenation of different structures in the presence of iron sulfide on the surface in

chloride-acetate hydrogen sulfide media and determination of their resistance to

hydrogen sulfide corrosion cracking and the main factors on it influencing is devoted.

The thesis is dedicated to correlation of the oxidation-reduction reactions rate

and hydrogenation of steels with a different structures in chloride-acetate hydrogen
sulphide media, taking into account the presence of iron sulphide on the surface of

steels. The resistance of steels to hydrogen sulphide corrosion cracking is determined.
A well-known scheme of the mechanism of hydrogen sulphide influence on

increasing of corrosion rate and steels hydrogenation has been supplemented.
The oxidation-reduction reactions of Sulfur have been established by cyclic

voltampermetry method. These reactions can influence on corrosion rate and

hydrogenation of steels in a sodium sulphide solution with the inert glass-graphite

electrode. It is concluded that oxidation is flowing with the release of Sulfur and the

subsequent slowing reaction of polysulphide formation, and the restoration with the

dissociation reaction of polysulphide ions with their previous adsorption.

It has been found that the potentials of anodic oxidation of hydrogen desorbed

from metal and oxidation of Armco iron to Fe(II) on cyclic voltamperograms are

coincided. This is confirmed by studies of Armco iron and platinum hydrogenation.