| Title |
A Study on Hydrogen Discharge by Electrochemical Technique |
| Authors |
박창규(Chang Gyu Park); 김재홍(Jae Hong Kim); 김정구(Jung Gu Kim); 안승호(Seung Ho Ahn); 박진석(Jin Suk Park); 김종성(Jong Seong Kim); 진태은(Te Eun Jin) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Hydrogen charge/discharge; SSRT; HIC; Potentiostatic/Galvanostatic test |
| Abstract |
Hydrogen embrittlement (HE) mitigation on the low alloy steel was studied using electrochemical technique. This method can be applied to reduce HE susceptibility. Hydrogen induced cracking (HIC) characteristics of the low alloy steel was investigated in aerated and deaerated borate buffer solution (0.3M H₃BO₃ + 0.074M N₂B_(4)O_(7), pH 8.4). The electrochemical properties of the low alloy steel showed passive behavior in this environment. By performing galvanostatic and potentiostatic test, hydrogen was charged and discharged to specimens respectively. By applying the potential of +630 mV_(SCE), the accumulated hydrogen was eliminated electrochemically. A specimen discharged for 24h indicated the efficiency of the hydrogen discharge up to 99.9%. Slow strain rate tests (SSRT) results showed that a specimen with higher hydrogen concentration revealed inferior mechanical properties such as shorter time to fracture, lower elongation, ultimate tensile strength and yield strength values. Furthermore, SEM fractographs revealed that the higher the hydrogen concentration is, the more probable the features of brittle fracture are. (Received July 26, 2004) |