Tendency of high-strength bolt steel toward corrosion cracking and hydrogen embrittlement

Shlyafirner, A. M.; Sotskov, N. I.; Panfilova, L. M.; Podol'skaya, E.P.

doi:10.1007/bf00720904

Cited by 1 publication

(2 citation statements)

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“…At a content up to 1.8% of iron and a temperature of 654 0 С, the eutectic Al + FeAl3 is formed. A further increase in the iron content in the alloy entails the appearance of chemical compounds of the following compositions: Fe2Al7 (62,93% Al), Fe2Al5 (54,71% Al), FeAl2 (49,13% Al), FeAl (32,57%) [2][3][4].…”

Section: Distribution Of Aluminium By Depth Of Samplesmentioning

confidence: 99%

“…The choice of the method of applying and type of coating should be based on the knowledge of the mechanisms of corrosion processes flow, the causes of their occurrence and methods for reducing the rate of corrosion processes. It should be noted that the choice of corrosion reduction mechanisms will depend on the coating and type of coating [4,5]. Types and methods of protection against corrosion begins on the creation of the structure and chemical composition of special steels [6,7], applying protective and protective-hardening coatings [9,11,12,17], structural protector methods [10,13,14] and end methods of using chemical protection and corrosion inhibitors [8, 15,16].…”

Section: Introductionmentioning

confidence: 99%

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Formation of Protective and Hardening Coatings on Reinforcing Steels

Anishchenko

Skachkov

Berezhna

et al. 2023

KEM

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A technique for applying a protective and hardening coating on steel 18G2S by electrodeposition from ionic melts has been developed. Melt in the triple eutectic point of salts NaF - 30%, NaCl - 16.6% and AlF3 - 53.4% is used as an electrolyte. During electrolysis, a graphite crucible was used as an anode, samples of reinforcing steel (18G2S) cleaned of corrosion and other contaminants were used as a cathode. The temperature of the ionic melt during electrolysis was 1120 ± 5K. In the process of electrolysis, the value of the electric current and voltage were controlled, the change in the mass of the deposited aluminium over a given time was measured. The current output during the deposition of aluminium was kept in the range of 89 ... 96 %. During electrolysis, aluminium diffuses into the surface layers of steel and with iron form solid solutions, intermetallic compounds and eutectics. At the same time, crystals of the FeAl3 compound (59.18% Al) appear in the structure. A further aluminium content decrease in the depth of the surface layer entails the appearance of chemical compounds of the following compositions: Fe2Al7, Fe2Al5, FeAl2 , FeAl. The elasticity limit and ultimate tensile strength of aluminium-coated samples compared to uncoated samples increased by 7.9% and 7.8% respectively. Electrochemical oxidation of samples with aluminium coating of reinforcing steel in sulfuric acid electrolyte was carried out. The oxidation rates for aluminium are set within (7.1... 8.3) 10-6 g / (s mm2) and iron (7.6 10.4) 10-6 g / (s mm2). Experimental assessment of samples oxidation rate under conditions of sulfuric acid electrolyte was carried out at an electric current value of 11 to 18 A.

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Section: Distribution Of Aluminium By Depth Of Samplesmentioning

confidence: 99%