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J. Ocean Eng. Technol. 2007;21(5):33-38.    

Evaluation of Characteristic for SS400 and STS304 steel by Weld Thermal Cycle Simulation - 2nd Report: Corrosion Characteristics
Ahn Seok-Hwan,Choi Moon-Oh,Kim Sung-Kwang,Son Chang-Seok,Nam Ki-Wook
School of Mechanical Engineering Pukyong National University,Busan Fire Services,Defence Agency for Technology and Quality,Defence Agency for Technology and Quality,Division of Materials Science and Engineering Pukyong National University
용접열사이클 재현에 의한 SS400강 및 STS304강의 특성 평가 -제2보: 부식특성
안석환,최문오,김성광,손창석,남기우
부경대학교 기계공학부,부산소방본부,국방기술품질원,국방기술품질원,부경대학교 신소재공학부
© 2007 The Korean Society of Ocean Engineers     Open access / Under a Creative Commons License
Keywords: Weld thermal cycle simulation, Corrosion, Polarization, Thermal stress, Weight loss ratio, Corrosion rate
핵심용어: 용접열사이클 재현, 부식, 분극, 열응력, 무게감소률, 부식속도
Abstract
The welding methods have been applied in the most structural products from multi-field of automobile, ship construction and construction, and so on. The structure steel must have enough strength of structure. In this study, SS400 steel and STS304 steel were used to estimate the corrosion characteristics of the weld thermal cycle simulated HAZ. To evaluate the corrosion characteristics, also, the materials with two conditions were used in 3.5% NaCl. The one is to the drawing with diameter of ${Phi}10$ and the other is to the residual stress removal treatment. The electrochemical polarization test and immersion test were carried out. From test results, corrosion potential, corrosion current density, weight loss ratio and corrosion rate were measured. In the kinds of SS400 steels, corrosion potential of weld thermal cycle simulated specimens after the heat treatment showed somewhat the direction of noble potential. And in the base metal to be drawing weight loss ratio and corrosion rate occurred higher than the other kinds. In the kinds of STS304 steels, the result of base metal to be drawing was similar to results of SS400 steels, too. Two kinds of $750^{circ}C$ and $1300^{circ}C$ of weld thermal cycle simulation after the heat treatment were rather higher than the other kinds in weight loss ratio and corrosion rate.


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