Corrosion protection of 1Cr18Ni9Ti stainless steel by polypyrrole coatings in HCl aqueous solution

The Protection Performance of Polypyrrole Coating Doped with Different Counter Anions for the Corrosion of NiTi Alloy

“…However, the corrosion potentials of the PPy/SO 4 or PPy/DBS coated electrodes increase with time, which is probably ascribed to the passivation of the substrate with the catalytic effect of the PPy coating. Additionally, the slow increase in corrosion potentials of the coated NiTi electrodes may also be related to the oxidation of PPy in the presence of nucleophile, such as H 2 O [22]. The undoping oxidation process of PPy coating may lead to the degradation of the coating, but this process is very slow at open circuit potential, and thus no obvious degradation can be observed during whole test.…”

“…However, it is still not clear how the doped anion affects the protective performance of PPy coating for NiTi alloy. Although conductive PPy coating had been extensively studied on the protection for carbon steel or stainless steel [22][23][24][25], there are fewer studies on its corrosion protective performance for NiTi alloy [2,10]. The protective mechanism is still not well understood due to the complex interface interaction process.…”

Corrosion resistance of PANi‐coated steel in simulated PEMFC anodic environment

“…Gan found that PANi is a promising material as an electrode for the anodic protection of ferrous metals in acidic solutions in industrial situations [21]. However, available information [22,23] is still very scarce on the use of conductive polymer coatings for PEMFC stainless steel bipolar plates. In this paper, we investigate the corrosion characteristics of conductive PANi-coated stainless steel in simulated anodic PEMFC environment.…”

Polypyrrole Composites: Electrochemical Synthesis, Characterizations and Applications

“…Recently, it has been demonstrated (Ren & Zeng, 2008) that a bilayer conducting polymer coating, composed of an inner layer of PPy with large dodecylsulfate ionic groups and an external PANI layer with small SO 4 2− groups, reduced the corrosion of the type 304 stainless steel, used for bipolar plates of a PEMFC, much more effectively than the single PPy coatings in 0.3M HCl. Besides these, some PPy-based composites such as PPy-CMC (carboximethylcellulose), PPy-SDS (sodium dodecylsulfate), PPy-TiNT (Titanate nanotube) and PPy-zinc phosphate were observed to protect steel (Herrasti & Ocoan, 2001), 1Cr18Ni9Ti stainless steel (Zhang &Zeng, 2005), stainless steel type 904L (Herrasti et al, 2011), and AISI 1010 steel (Lenz et al, 2007) surfaces effectively from corrosion, respectively. Electrochemically prepared PPy-WO 4 2- (Sabouri et al, 2009), PPy/PANI (Panah & Danaee, 2010) and Pt/PPy (Rahman, 2011) composite films provided noticeable corrosion inhibition for carbon steel, whereas PPy-TiO 2 (Lenz et al, 2003) (Kowalski et al, 2008), and PPy-PANAP (poly(5-amino-1-naphthol)) (Bereket & Hur, 2009) provided better protection for corrosion of mild steel.…”