An Investigation of Cast Iron Corrosion Behavior in Chloride Containing Engine Coolant Environment

Argade, Gaurav; Chilukuri, Anusha; Lugo, G.; Perry, Justin J.; Raisor, E.; Schafer, R.; Steenhoek, J.; Trobaugh, C.

doi:10.7449/2019/mst_2019_737_741

Cited by 3 publications

(1 citation statement)

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“…However, this peak is shifted slightly higher than 1560 cm −1 for the coupon immersed in the 100 ppm Cl − containing coolant indicating that the carboxylate salts present in the pitted region of this coupon may also contain some of the other alloying elements from the base material. The formation of metal-chelate in presence of TTA and 2-EH in combination appeared to have influenced the corrosion inhibition of cast iron [32,33]. There is a formation of metalcomplex chelate which gets adsorped on the surface to prevent interaction of corrosive species with the base metal.…”

Section: Inhibition Mechanismmentioning

confidence: 99%

Corrosion Behavior of Alloyed Cast Iron in Ethylene Glycol-Based Engine Coolants at Elevated Temperature

et al. 2021

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For enhanced engine performance, corrosivity of the engine coolants would play a significant role. In this work, corrosion investigation was performed on cast iron material in pre-mixed engine coolant environment to understand the threshold limits of contaminants. The pre-mixed coolant contained combination of organic additives viz. sebacate (SA), 2-ethylhexonate (2-EH), and tolyltriazole (TTA) with varying concentrations of chloride contaminant. Constant immersion of cast iron samples in engine coolant with different chloride levels at 90 °C was followed by room temperature electrochemical tests. The potentiodynamic polarization tests showed no instability until 100 ppm chloride additions exposed up to 28 days. At lower frequencies in electrochemical impedance spectroscopy (EIS) spectra, inhibition layer characteristics changed from highly capacitive to highly resistive and concurrently a sharp decrease in charge transfer resistance was observed with time for samples exposed to >100 ppm chloride levels. In the longer duration corrosion tests, higher pit depths with increased number density of attacks were observed for cast iron samples exposed to engine coolants containing >100 ppm chloride. For elevated temperature exposures a threshold limit of <200 ppm chloride was established for cast iron samples.

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Section: Inhibition Mechanismmentioning

confidence: 99%