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한검욱 ( Han¸ Gum-wook ),유석형 ( Yoo¸ Suk-hyung ),한범석 ( Han¸ Beom-seok ),안종문 ( Ahan¸ Jong-moon ),이한승 ( Lee¸ Han-seung ),신성우 ( Shin¸ Sung-woo ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.2
Corrosion of reinforcement is a major problem affecting a large number of reinforced concrete structures, this paper presents the results of an experimental study on reinforced concrete beams to determine their residual flexural capacity after undergoing different corrosion degrees (corrosion length, corrosion location, corrosion rate) of reinforcing bars. Corrosion was induced in the laboratory by an accelerated corrosion technique using two sources of external power supply. The results show marked reductions in flexural strength due to reinforcement corrosion.
반용융 성형가공된 AZ 91 HP Mg 합금의 아연치환도금에 관한 연구
김세광,김영직,한혜준,한범석 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.3
Magnesium alloys have received an increasing amount of attention in recent years due to their exceptionally low densities and high specific strengths. Among various manufacturing methods for magnesium alloys, semi-liquid forming has advantages of near net shape and the safety over inflammable magnesium alloys. The objective of this paper was to produce a electroplating base for semi-liquid formed AZ91HP magnesium alloy, consisting of activations and zinc immersion deposition. The variations of the surface potentials with time were conducted both during activations and zinc immersion deposition. The results indicate that oxalic/chromic activation sequence can produce a good foundation for zinc immersion deposition and by the double-dip technique, thin and homogeneous zinc immersion deposits can be obtained in shorter time compared with the normal single-dip technique. The growth mode of zinc immersion deposits largely depends on the surface potential deviations caused by the differences of microstructures and phases.