Comparison between Corrosion in Static and Vibrated Medium for Medium Carbon Steel Type CK45

Abstract

In this research the natural gas cylinder steel type (CK45) samples were prepared by traditional preparation operations , chemical composition of samples was analyzed , the hardness was tested, then corrosion testing was achieved for the two major cases, a general corrosion case when the corrosive medium (sea water and weak carbonic acid) was static for four hours , and the second case was corrosion with presence of mechanical vibration, which included two sub-cases , in first case; corrosion of vibrated samples with vibrated corrosive medium, and in second case when the samples were fixed and corrosive medium was vibratory , a total test period was four hours for each case ,then weight loss and the corrosion rate of all cases of corrosion mentioned was calculated by a traditional weight loss method , as well as the microstructures before and after the corrosion cases were studied. The weight loss and corrosion rate reached the highest value in the second case of corrosion with presence of mechanical vibration were observed for (fixed samples and corrosive medium is vibratory), than first case of corrosion with presence of mechanical vibration (vibrated samples with the vibrated corrosive medium), and less value of corrosion rate and weight loss in case of general corrosion (corrosion in static medium)...