Mechanism of pitting corrosion protection of metals and alloys in new-generation water treatment plants

Abstract

Abstract. In this article authors set out a principle of pitting corrosion protection, suggested a new class of multilayer materials with high corrosion resistance. They substantiated the choice of the layers for the multilayer material designed for exploitation in oxidizing and non-oxidizing environment. The sphere of application of the multilyer materials was defined.

Effect of surface grinding on the microstructure and corrosion of Al-Mg-Si-Cu alloys

“…As shown in figure 9, these cavities of the three samples grow faster in the parallel direction than that in the vertical direction [36]. Simultaneously, pits continue to expand due to their autocatalytic properties [42].…”

Stainless steel corrosion in instrumentation pipe

“…It is also important to note that the percentage of C is within the range specifi ed by the standard. The formation of precipitates can establish the pitting phenomenon because, according to Martins and Lebrão (2012) and Grachev et al (2017), the presence of precipitates is an indication for occurrence pitting corrosion, with pitting occurring in anodic areas on the steel surface. Figure 5 shows the presence of elements typically found in the marine atmosphere (Cl, Na, K, Ca and Mg), as well as Si, S, Fe, Al, Zn, Ba, Cr and Ni as peaks of the chlorine element, main responsible for the rupture of the passive protective fi lm.…”