Evolution of corrosion in cast Al alloy in antifreeze radiator coolant

Karan

et al. 2023

Preprint

The performance of four different C18 chromatography analytical columns with different lengths and particle sizes were compared for analysis of engine coolant additives such as benzotriazole (BTz), tolyltriazole (TTz), sodium benzoate and cinnamic acid using high performance liquid chromatography (HPLC) with UV-visible detector. Chromatographic parameters including retention time, resolution, limit of detection (LOD), limit of quantification (LOQ), number of theoretical plates and reduced plate height were evaluated and compared. In this work, the performance of 5µm particles of Kinetex and Acclaim C18 chromatography columns has been compared with new positive surface (PS) and polar C18 columns having 3µm particles for the analysis of above additives. The results show that in comparison with the traditional columns having dimensions 250 mm×4.6 mm; 5µm, shorter columns namely polar C18 and positive surface (PS C18) having dimensions 150 mm×4.6 mm; 3 µm allowed the reduction of the analysis time by 44.8% and 45.8% respectively without compromising on column performance. This leads to the reduction of analysis expenses by reducing the organic solvents and time, and increasing the total number of analyses per day. Among two smaller columns, the resolution of positive surface C18 is found to be better as compared to polar C18 column though the analysis times remains almost same. The mobile phase CH3OH (70%): 0.5%H3PO4 in water (30%) was used at a flow rate of 0.8 mL/min and the injection volume in all the case was 20.0 µl. The capabilities of these columns for analyzing engine coolant samples in glycol based aqueous media were evaluated.

Section: Introductionmentioning

confidence: 99%

Comparative study of four different C 18 HPLC columns with different particle sizes and lengths for the optimization of UV absorbing engine coolant additives analysis

Karan

et al. 2023

Preprint

“…Heat transfer corrosion is one of the biggest problems for HTFs which consists of the combination of dissimilar metal components, including aluminum, cast iron, brass, solder and copper operating on the thermal solar systems at high temperatures (Zhou et al , 2008). HTFs with corrosion inhibitors protect metal parts of the solar water-heating systems.…”

Section: Introductionmentioning

confidence: 99%

Monopropylene glycol based heat transfer fluid: effects of green and synthetic corrosion inhibitors on copper and aluminum with ageing tests

Akın¹,

Şaki

2018

ACMM

Purpose The purpose of this paper is to understand corrosion behavior of copper and aluminum in monopropylene glycol-based heat transfer fluid by using synthetic and green inhibitors. Design/methodology/approach Weight loss, potentiodynamic and impedance measurements were applied to specimens to obtain their electrochemical characteristics and corrosion behaviors. Ageing test was applied to the fluids that contain different corrosion inhibitors to see the effect of inhibitors on fluid structure, and surface morphologies were examined by scanning electron microscopy (SEM). Findings The corrosion tests showed that synthetic inhibitors have better anti-corrosion potential than green inhibitors. Social implications Like the synthetic corrosion inhibitors, there is growing interest in green inhibitors. Synthetic corrosion inhibitors are expensive and toxic for live beings, but green inhibitors from naturel sources are easy to reach and non-toxic for live beings and environment. Originality/value For solar heating systems, there is a need to select the correct heat transfer fluid; corrosion behavior of fluid plays a major role in the operation because the big part of the heating system consists of copper and aluminum close to ferrius metals and stainless steel.

“…Coolant is an important environmental medium when the magnesium alloys were used as engine block. The commonly used coolant is composed of 30–70 vol% aqueous ethylene glycol solutions with addition of inhibitors, normally including some inorganic salts and organic acid‐based salts 6–8. Some research works have been conducted with regard to the corrosion of magnesium alloy in ethylene glycol‐based coolants 9–14.…”

Section: Introductionmentioning

confidence: 99%

Corrosion and self‐healing behaviour of AZ91D magnesium alloy in ethylene glycol/water solutions

Wang

Liang

2011

Materials & Corrosion

Corrosion behaviour of magnesium alloy-based engine parts in cooling system is an urgent fundamental issue in automotive field where magnesium alloys are increasingly used. In the present work, the corrosion behaviour of AZ91D magnesium alloys in various ethylene glycol/water solutions was studied by electrochemical measurements and immersion tests at room temperature. The surfaces of the samples after immersion tests were examined using scanning electron microscope (SEM) and X-ray diffraction (XRD). The results showed that the corrosion rates of AZ91D magnesium alloys decreased with the increase of ethylene glycol concentration in ethylene glycol/water solutions and the corrosion process was dominated by pitting corrosion. A continuous protective film transferred from corrosion products was formed on the corroded surface after sufficient immersion duration in ethylene glycol/water solutions, which is able to heal the corrosion pits. The self-healing behaviour inhibited the further corrosion of AZ91D magnesium alloy.