Pitting corrosion of zinc in neutral halide solutions

On the role of NO2− ions in passivity breakdown of Zn in deaerated neutral sodium nitrite solutions and the effect of some inorganic inhibitors

“…For these reasons, the corrosion behaviour of zinc has attracted the attention of several investigators in a wide variety of media [5][6][7][8][9][10][11][12][13][14][15]. Zinc suffers pitting corrosion when exposed to aggressive anions such as halide ions [16][17][18][19], ClO 4 showed that SCN − ions [24] and NO 3 − ions [25] caused severe pitting corrosion to Zn.…”

Pitting corrosion of zinc in alkaline medium by thiocyanate ions

“…The active dissolution of Zn involves the formation of Zn(OH) 2À 4 complex species, while the passivation is due to the formation of Zn(OH) 2 film on the electrode surface [5][6][7]. On the other hand, the Zn electrode suffers pitting corrosion when exposed to alkaline media containing aggressive anions such as halide ions [8][9][10][11], perchlorate ions [12] and sulphate ions [13].…”

Electrochemical contrast switching between black and white appearance of gelatin-covered zinc

“…The SEM micrographs recorded after CVs (figure 5(a) and (b)) show, amongst others, pits as a result of pitting corrosion. A sharp increase in current density as observed in the electrochemical experiments (figure 2) is also characteristic for pitting corrosion on otherwise oxide-passivated metals in media containing complexing ions such as chloride anions [19,49,50]. The C 1 and C 2(a) peaks in figure 2(b) are attributed to reduction of Zn II to metallic zinc.…”