Investigation on the soil corrosivity towards the buried water supply pipelines in Kamerotar town planning area of Bhaktapur, Nepal

Dhakal, Yub Raj; Dahal, Kumar Prasad; Bhattarai, Jagadeesh

doi:10.3126/bibechana.v10i0.8454

Cited by 13 publications

(12 citation statements)

References 9 publications

(28 reference statements)

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“…The inhibition efficiency of sodium metavanadate for controlling corrosion of carbon steel in an aqueous solution containing chloride ion was evaluated (Sribharathy & Rajendran, 2012). However, a few studies are reported about the corrosion behavior of different steels used in Nepal in aqueous solutions (Bhattarai, 2008(Bhattarai, , 2009Bhattarai et al, 2007) and corrosion of buried corrosive nature of soils towards the galvanized-steel as well as cast-iron pipes used for the drinking water supply in Nepal were also reported by some researchers (Bhandari et al, 2013;Bhattarai et al, 2016;Bhattarai, 2013;Dahal et al, 2014;Dhakal et al, 2014;Gautam and Bhattarai, 2013). In this context, present research work was focused to study the effect of sodium tungstate as a green corrosion inhibitor on the corrosion behavior of the mild steel used Nepal in different aggressive aqueous media.…”

Section: Research Articlementioning

confidence: 90%

Effect of Sodium Tungstate as a Green Corrosion Inhibitor on the Passivation Behavior of Mild Steel Sheet in Aggressive Media

Deepak

Bhattarai

2016

Int J Appl Sci Biotechnol

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The effect of sodium tungstate on the passivation behavior of grille sheet made by mild steel was studied using corrosion tests and electrochemical measurements in 1 M HCl, 0.5 M NaCl and 1 M NaOH solutions, open to air at 25 °C. The grille sheet showed the highest corrosion resistance properties in 1 M NaOH solution as compared with 1 M HCl and 0.5 M NaCl solutions. The corrosion resistance properties of the steel sheet was decreased with increasing the concentration of sodium tungstate up to 800 ppm and its corrosion inhibition efficiency was increased with increasing the concentration. The open circuit potential of the mild steel sheet was more negative value in 0.5 M NaCl than that in 1 M HCl, whereas more positive potential value was observed in 1 M NaOH than in 0.5 M NaCl solution. It was found that the mild steel sheet used in the study was found to be more passive in 1 M NaOH than in 1 M HCl and 0.5 M NaCl solutions. Hence, a more stable anodic passive film was formed on the surface of the steel sheet in 1 M NaOH than those in 1 M HCl and 0.5 M NaCl solutions from electrochemical measurements.

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Section: Research Articlementioning

confidence: 90%

Effect of Sodium Tungstate as a Green Corrosion Inhibitor on the Passivation Behavior of Mild Steel Sheet in Aggressive Media

Deepak

Bhattarai

2016

Int J Appl Sci Biotechnol

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“…Gravimetric method was used to estimate the amounts of sulfate content in soil samples. The details of these all methods are also discussed elsewhere (Dahal et al, 2014;Dhakal et al, 2014;Bhandari et al, 2013;Bhattarai, 2013aBhattarai, , 2013bGautam & Bhattarai, 2013;Bhattarai et al, 2016).…”

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confidence: 99%

Soil corrosivity to the buried-pipes used in Lalitpur, Kathmandu Valley, Nepal

Regmi

Dahal

Bhattarai

2015

Nep Jnl Environ Sci

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Six soil parameters (moisture content, pH, resistivity, oxidation-reduction potential, chloride and sulfate) of 23 samples were analyzed using standard methods for their corrosive nature towards the buried galvanized-steel and cast-iron pipes used to supply drinking water in three areas (Tikathali, Imadol- KA and Imadol-KHA) of Lalitpur district of Kathmandu Valley. Amounts of these six soil parameters in the collected 23 samples were found to be of 11–37% moisture content, 6.1–8.4 pH, 0.3330 x 104– 4.7620 x104 Ohm.cm resistivity, 317–553 mV (SHE) oxidation-reduction potential, 14–75 ppm chloride and 56–176 ppm sulfate contents. These findings indicated that most of soil samples collected from the study areas of Lalitpur district of Nepal are found to be mildly corrosive and less corrosive nature of soils on the buried galvanized-steel and cast-iron pipes used for the supply of drinking water. The use of non-conducting materials like gravel/sand around the buried-pipes, before burying them in the study areas seems to be effective to control such corrosion and to increase life time of the pipes.

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“…A detailed study about the properties of porcelain raw materials deposited in Pachamane (Shivapuri conservation area of Kathmandu district) and Daman (Makawanpur district) areas of Nepal was carried out since the 1990s [9,32,[41][42][43]. However, there are no detailed research works carried out yet on the geological genesis study of the natural white clay minerals deposited in the Thimi area of Bhaktapur, except their corrosive behavior to the buried-metallic pipelines [44,45], and adsorption characteristics [18]. In this context, the present work aimed to explore the geological genesis of the Thimi white clays based on their qualitative and quantitative data analyses.…”

Section: Introductionmentioning

confidence: 99%

Genesis Exploration of White Clays Deposited in Thimi Area of Kathmandu Valley

Dhakal¹,

Duwal²,

Adhikari³

et al. 2021

J. Nepal Chem. Soc.

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The geological genesis of the Thimi-Sanothimi white clay deposits of Kathmandu Valley was explored employing mineralogical and chemical analyses in this research. For the study, two sample specimens of the clay having two types of particle size, i.e., about < 63 µm (bulk) and < 2 µm (fine), were separated with the help of standard sieve mesh which further modified using high-temperature heat, and 1 M HCl and 1 M KCl solution treatments. For the most part, both the clay fractions constituted of 2:1 type of vermiculite and mica (mainly of K-mica type) clay minerals with different feldspars and quartz phases as clay admixtures from the results of the mineralogical phase analysis. The chemical constituents of the clay particles with < 63 µm, < 2 µm, and the HCl-treated sample specimens confirmed the existence of a high quantity of SiO2 with comparatively low Al2O3 which indicates the presence of fewer amounts of the vermiculite and mica minerals comparatively with feldspars and quart admixtures in the analyzed white clay samples. Moreover, the clay sample contained a considerable quantity of Fe2O3 and MgO chemicals which are not favorable raw material constituents for good quality porcelains and white-wares products without refining and chemical-modifications. The present work could be the first step to explore its potentiality in various industrial sectors like table-ware, sanitary-ware, brick and tile ceramics, paper and pulp, petrochemical, pharmaceutical including environmental pollution controlling agents in Nepal.

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Investigation on the soil corrosivity towards the buried water supply pipelines in Kamerotar town planning area of Bhaktapur, Nepal

Cited by 13 publications

References 9 publications

Effect of Sodium Tungstate as a Green Corrosion Inhibitor on the Passivation Behavior of Mild Steel Sheet in Aggressive Media

Effect of Sodium Tungstate as a Green Corrosion Inhibitor on the Passivation Behavior of Mild Steel Sheet in Aggressive Media

Soil corrosivity to the buried-pipes used in Lalitpur, Kathmandu Valley, Nepal

Genesis Exploration of White Clays Deposited in Thimi Area of Kathmandu Valley

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