Cerium-based conversion coatings as alternatives to hex chrome

O’Keefe, Matthew J.; Geng, Sujiang; Joshi, Simon

doi:10.1016/s0026-0576(07)80547-2

Cited by 26 publications

(5 citation statements)

References 5 publications

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“…[27][28][29] Chromate conversion films are usually prepared by chemical treatment and have a low thickness. A number of compounds of several transition metals in a high oxidation state have been used for chemical conversion coatings, such as titanium, 38 vanadium, 39 zirconium and niobium, 40 manganese, 41,42 cobalt, 43 molybdenum, 44 tungsten and silicon, 45 cerium, 40,[46][47][48][49] and other rare earth metals. To increase the sustainability of the protective effect, chromate anticorrosive pigments such as CaCrO 4 , SrCrO 4 , or BaCrO 4 should be incorporated into the more extended primer layer.…”

Section: Methods For Combating Corrosion: Short Overviewmentioning

confidence: 99%

Anticorrosion Coatings with Self-Recovering Ability Based on Damage-Triggered Micro- and Nanocontainers

Grigoriev

2015

Intelligent Coatings for Corrosion Control

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Section: Methods For Combating Corrosion: Short Overviewmentioning

confidence: 99%

Anticorrosion Coatings with Self-Recovering Ability Based on Damage-Triggered Micro- and Nanocontainers

Grigoriev

2015

Intelligent Coatings for Corrosion Control

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“…These inhibitors function to reduce the dissolution rate of the passivating oxide [43], repassivating the surface by repair or reformation of the oxide film, repairing the oxide film by plugging pores with insoluble compounds and preventing the adsorption of aggressive anions. An example of this type of inhibitor is chromate ions, which should be replaced by more environmental inhibitors, such as rare earth elements [44,45], also, molybdate, nitrite and phosphate [46]. In the case of cathodic inhibitors the potential shifts towards more negative values (cathodic direction).…”

Section: Corrosion Remedies To Decrease Pollutionmentioning

confidence: 99%

Corrosion protection with eco-friendly inhibitors

Shahid¹

2011

Adv. Nat. Sci: Nanosci. Nanotechnol.

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Corrosion occurs as a result of the interaction of a metal with its environment. The extent of corrosion depends on the type of metal, the existing conditions in the environment and the type of aggressive ions present in the medium. For example, CO 3 −2 and NO −3 produce an insoluble deposit on the surface of iron, resulting in the isolation of metal and consequent decrease of corrosion. On the other hand, halide ions are adsorbed selectively on the metal surface and prevent formation of the oxide phase on the metal surface, resulting in continuous corrosion. Iron, aluminum and their alloys are widely used, both domestically and industrially. Linear alkylbenzene and linear alkylbenzene sulfonate are commonly used as detergents. They have also been found together in waste water. It is claimed that these chemicals act as inhibitors for stainless steel and aluminum. Release of toxic gases as a result of corrosion in pipelines may lead in certain cases to air pollution and possible health hazards. Therefore, there are two ways to look at the relationship between corrosion and pollution: (i) corrosion of metals and alloys due to environmental pollution and (ii) environmental pollution as a result of corrosion protection. This paper encompasses the two scenarios and possible remedies for various cases, using ‘green’ inhibitors obtained either from plant extracts or from pharmaceutical compounds. In the present study, the effect of piperacillin sodium as a corrosion inhibitor for mild steel was investigated using a weight-loss method as well as a three-electrode dc electrochemical technique. It was found that the corrosion rate decreased as the concentration of the inhibitor increased up to 9×10−4 M; 93% efficiency was exhibited at this concentration.

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“…It can be concluded that the deposition of selected oxide layers [8][9][10][11][12][13][14][15][16][17][18] mainly on stainless steels is the subject of intensive research worldwide. To the best of our knowledge there is practically no information (or the latter is rather scarce) available in the world scientific literature on the deposition of such layers as a top coating on galvanized steel.…”

Section: Introductionmentioning

confidence: 99%

Protective Efficiency of ZrO2/Chitosan “Sandwich” Coatings on Galvanized Low-Carbon Steel

et al. 2021

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Enhanced corrosion efficiency of low-carbon steel was achieved by newly developed hybrid multilayers, composed of low-carbon steel coated with an electrodeposited zinc sublayer (1 µm), a chitosan (CS) middle layer and ZrO2 coating by the sol–gel method (top-layer). The middle chitosan layer was obtained by dipping galvanized steel substrate in 3% tartatic acid water solution of medium molecular-weight chitosan, composed of β-(1–4)-linked D-glucosamine and N-acetyl-D-glucosamine with a deacetylation degree of about 75–85% (CS). The substrates were dipped into CS solution and withdrawn at a rate of 30 mm/min. One part of the samples with the CS layer was dried at room temperature for 2 weeks, and another part at 100 °C for 1 h, respectively. After CS deposition treatment, the substrates were dipped into an isopropanol sol of zirconium butoxide with small quantity of polyethylene glycol (PEG400). The dipping-drying cycles of the ZrO2 coatings were repeated three times. After the third cycle, the final structures were treated at 180 °C. The samples were denoted as T25, which consists of the CS middle layer, and dried at RT and T100 with the CS middle layer treated at 100 °C, respectively. The samples were characterized by means of differential thermal analysis (DTA-TG), XRD analyses, X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). Hydrophobicity properties were evaluated by measuring the contact angle with a ramé-hart automated goniometer. Two electrochemical tests—potentiodynamic polarization technique (PD) and electrochemical impedance spectroscopy (EIS)—have been used to determine the corrosion resistance and protective ability of the coatings in a 5% NaCl solution. The results obtained by both methods revealed that the applied “sandwich” multilayer systems demonstrate sacrificial character and will hopefully protect the steel substrate in corrosion medium containing chloride ions as corrosion activators. The newly obtained hybrid multilayer coating systems have dense structure and a hydrophobic nature. They demonstrated positive effects on the corrosion behavior at conditions of external polarization independent of their various characteristics: morphology, grain sizes, surface roughness and contact angle. They extend the service life of galvanized steel in a chloride-containing corrosion medium due to their amorphous structure, hydrophobic surface and the combination of the positive features of both the chitosan middle layer and the zirconia top layer.

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Cerium-based conversion coatings as alternatives to hex chrome

Cited by 26 publications

References 5 publications

Anticorrosion Coatings with Self-Recovering Ability Based on Damage-Triggered Micro- and Nanocontainers

Anticorrosion Coatings with Self-Recovering Ability Based on Damage-Triggered Micro- and Nanocontainers

Corrosion protection with eco-friendly inhibitors

Protective Efficiency of ZrO2/Chitosan “Sandwich” Coatings on Galvanized Low-Carbon Steel

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