Corrosion Behavior of Fe-P Binary Alloys in Low-pH Solution

Abstract

Phosphorus is well known as an element which is difficult to be completely removed from steels and affects workability, welding property, and corrosion resistance. In atmospheric corrosion of steels, phosphorus improves the corrosion resistance by the formation of compact and high-density rust. In contrast, phosphorus increases the corrosion rate of steels in hydrochloric acid, but the precise reason is still unclear.In this research, the effect of phosphorus on corrosion behavior of Fe-P binary alloys was investigated by electrochemical measurements and immersion test in a low-pH solution, and corrosion morphology was examined by scanning electron microscopy.