Comparison of Conventional and Organic Acid Technology (OAT) Coolants in Heavy Duty Diesel Engine Service

Hudgens, R. D.

doi:10.4271/1999-01-0130

Cited by 9 publications

(2 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…chlorides, nitrates, sulfates, carbonates [2]. To protect cast irons from corrosion, the engine coolants typically contain corrosion inhibitors e.g., organic acids, inorganic additives, or combinations of both to simultaneously boost the corrosion resistance and heat transfer performance [3,4]. Pellet et al compared the corrosion inhibition of cylinder liners in engine coolants containing nitrites and carboxylates which reported improved liner protection in presence of carboxylates and showed no necessity of refortification of the additives [5].…”

Section: Introductionmentioning

confidence: 99%

“…Studies have shown use of azoles as corrosion inhibitors on ferrous alloys (steels) and enhancement in corrosion resistance is attributed to adsorption of organic chain on the substrate [11,12]. Organic acid technology (OAT) coolants (wherein one or more organic acids are mixed together) have been reported to show marked increase in the corrosion inhibition of ferrous as well as non-ferrous engine components [3,13]. Santambrogio et al showed that the kinetics of corrosion are significantly affected due to formation of complex between Fe ions and the major degradation acidic products viz.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

et al. 2021

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%