scholarly journals Pengaruh Konsentrasi Natrium Silikat Terhadap Laju Korosi Paduan Aluminium dalam Lingkungan Natrium Klorida 3,5%

2020 ◽  
Vol 16 (2) ◽  
pp. 67
Author(s):  
Rukiah Rukiah ◽  
Diding Mandala Putra ◽  
Solihudin Solihudin ◽  
Yeni Wahyuni Hartati ◽  
Atiek Rostika Noviyanti
Keyword(s):  
Aluminum Alloy ◽  
Sodium Chloride ◽  
Corrosion Rate ◽  
Sodium Silicate ◽  
Chloride Ions ◽  
Optimum Concentration ◽  
Ion Concentration ◽  
Silicate Concentration ◽  
Aluminum Corrosion

<p><span id="docs-internal-guid-16dbe470-7fff-c41c-0744-77bf71d25737"><strong>ABSTRAK.</strong><span> Korosi merupakan proses penurunan kualitas logam akibat reaksi logam dengan lingkungannya. Air laut merupakan salah satu sistem yang korosif karena tingginya kadar ion klorida. Ion silikat dengan konsentrasi optimum mampu memperlambat laju korosi pada logam, seperti aluminium. Penelitian ini menguji pengaruh ion silikat dalam larutan natrium klorida 3,5% terhadap laju korosi aluminium yang diuji dengan metode potensiostat dan dihitung dengan Ekstrapolasi Tafel. Pengaruh konsentrasi ion silikat terhadap laju korosi diamati pada variasi konsentrasinya yaitu 0, 25, 50, 75, dan 100 mM. Konsentrasi optimum natrium silikat untuk menurunkan laju korosi adalah 25 mM,  laju korosi turun dari 0,0118 menjadi 0,0084 mm/tahun. Sebaliknya, penambahan konsentrasi natrium silikat hingga 100 mM,  dapat meningkatkan laju korosi menjadi 0,101 mm/tahun.</span></span></p><p><span><span><span id="docs-internal-guid-17392559-7fff-0660-df12-7a65eee22bac"><span><strong>ABSTRACT. The Effect of Sodium Silicate Concentration on the Corrosion Rate of Aluminum Alloy in Sodium Chloride 3.5%.</strong> </span><span>Corrosion is a process of decreasing the quality of metals due to the reaction of metals with their environment. Seawater is one of the corrosive systems because of the high levels of chloride ions. Silicate ions with optimum concentrations can slow the rate of corrosion in metals, such as aluminum. This research examines the effect of silicate ions on the aluminum corrosion rate in a solution of sodium chloride 3.5%, tested by the potentiostat method and calculated by Tafel extrapolation. The effect of silicate ion concentration on the corrosion rate was observed in various concentrations of 0, 25, 50, 75, and 100 mM. The optimum concentration of sodium silicate in reducing the corrosion rate is 25 mM, in which the corrosion rate drops from 0.0118 to 0.0084 mm/year. Conversely, increasing the concentration of sodium silicate to 100 mM increased the corrosion rate to 0.101 mm/year.</span></span></span></span></p>

scholarly journals Pengaruh Konsentrasi Natrium Silikat Terhadap Laju Korosi Paduan Aluminium dalam Lingkungan Natrium Klorida 3,5%

2020 ◽  
Vol 16 (2) ◽  
pp. 218
Author(s):  
Rukiah Rukiah ◽  
Diding Mandala Putra ◽  
Solihudin Solihudin ◽  
Yeni Wahyuni Hartati ◽  
Atiek Rostika Noviyanti
Keyword(s):  
Aluminum Alloy ◽  
Sodium Chloride ◽  
Corrosion Rate ◽  
Sodium Silicate ◽  
Chloride Ions ◽  
Optimum Concentration ◽  
Ion Concentration ◽  
Silicate Concentration ◽  
Aluminum Corrosion

<p><span id="docs-internal-guid-16dbe470-7fff-c41c-0744-77bf71d25737"><span>Korosi merupakan proses penurunan kualitas logam akibat reaksi logam dengan lingkungannya. Air laut merupakan salah satu sistem yang korosif karena tingginya kadar ion klorida. Ion silikat dengan konsentrasi optimum mampu memperlambat laju korosi pada logam, seperti aluminium. Penelitian ini menguji pengaruh ion silikat dalam larutan natrium klorida 3,5% terhadap laju korosi aluminium yang diuji dengan metode potensiostat dan dihitung dengan Ekstrapolasi Tafel. Pengaruh konsentrasi ion silikat terhadap laju korosi diamati pada variasi konsentrasinya yaitu 0, 25, 50, 75, dan 100 mM. Konsentrasi optimum natrium silikat untuk menurunkan laju korosi adalah 25 mM,  laju korosi turun dari 0,0118 menjadi 0,0084 mm/tahun. Sebaliknya, penambahan konsentrasi natrium silikat hingga 100 mM,  dapat meningkatkan laju korosi menjadi 0,101 mm/tahun.</span></span></p><p><span><span><span id="docs-internal-guid-17392559-7fff-0660-df12-7a65eee22bac"><span><strong>The Effect of Sodium Silicate Concentration on the Corrosion Rate of Aluminum Alloy in Sodium Chloride 3.5%.</strong> </span><span>Corrosion is a process of decreasing the quality of metals due to the reaction of metals with their environment. Seawater is one of the corrosive systems because of the high levels of chloride ions. Silicate ions with optimum concentrations can slow the rate of corrosion in metals, such as aluminum. This research examines the effect of silicate ions on the aluminum corrosion rate in a solution of sodium chloride 3.5%, tested by the potentiostat method and calculated by Tafel extrapolation. The effect of silicate ion concentration on the corrosion rate was observed in various concentrations of 0, 25, 50, 75, and 100 mM. The optimum concentration of sodium silicate in reducing the corrosion rate is 25 mM, in which the corrosion rate drops from 0.0118 to 0.0084 mm/year. Conversely, increasing the concentration of sodium silicate to 100 mM increased the corrosion rate to 0.101 mm/year.</span></span></span></span></p>

scholarly journals Corrosion Rate of Aluminum Alloy in Moving Sodium Chloride Solution

1998 ◽  
Vol 47 (4) ◽  
pp. 254-259 ◽  
Author(s):  
Yasuyuki Takatani ◽  
Tsuyoshi Masugata ◽  
Kazuo Fujiwara ◽  
Koichi Shinkai ◽  
Koichi Hayashi
Keyword(s):  
Aluminum Alloy ◽  
Sodium Chloride ◽  
Corrosion Rate ◽  
Chloride Solution ◽  
Sodium Chloride Solution

scholarly journals The Impact of Chloride and Sulphate Aggressiveness on the Microstructure and Phase Composition of Fly Ash-Slag Mortar

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4430
Author(s):  
Paweł Falaciński ◽  
Agnieszka Machowska ◽  
Łukasz Szarek
Keyword(s):  
Compressive Strength ◽  
Phase Composition ◽  
Sodium Chloride ◽  
Chloride Ion ◽  
Sodium Sulphate ◽  
Chloride Ions ◽  
Ion Concentration ◽  
Pore Liquid ◽  
A Minor ◽  
The Impact

The article discusses the results of examining the impact of aggressive solutions on specimens of mortars with a slag-ash binder. Bar specimens were exposed to unidirectional diffusion of sodium chloride and sodium sulphate for 90 days. Next, the specimens were subjected to flexural and compressive strength tests, ion content tests, XRD phase composition tests, and microstructural SEM-EDS tests. The test results indicated that aggressive solution action resulted in decreased flexural strength, however, it did not impact the compressive strength of mortars. A minor impact of chloride ions on the pH of the pore liquid was recorded, while the tests did not show any influence of sulphate ions. Furthermore, aggressive ion concentration decreased in deeper specimen slices. Specimen phase composition testing after chloride ion action indicated the presence of a small amount of Friedel’s salt, while regular sodium chloride crystals were identified in the microscopic image. The performance properties of mortars exposed to the action of aggressive solutions were maintained.

scholarly journals The Status of Abiotic Components in Aquatic Environment of Khaste Lake, Pokhara

2021 ◽  
pp. 9-17
Author(s):  
Raju Kumar Poudel
Keyword(s):  
Water Quality ◽  
Research Work ◽  
Chloride Ions ◽  
Ion Concentration ◽  
Total Alkalinity ◽  
World Health ◽  
Chemical Parameters ◽  
Hydrogen Ion Concentration ◽  
Waste Dumps

Water is one of the most significant natural resources. In plants and animals, different physiological processes like respiration, photosynthesis, absorption of nutrients and other metabolic process get influenced by the amount of availability of water. This study has been conducted to evaluate water quality of Khaste Lake, Pokhara. After the collection of water samples, chemical parameters such as dissolved oxygen (DO), free carbon dioxide (F-CO2), hydrogen ion concentration (pH), total alkalinity (TA), total hardness (TH), total solid (TS), total dissolved solid (TDS), calcium (Ca), magnesium (Mg) and chloride ions (Cl-) have been measured in the chemistry laboratory, using standard methods prescribed by American Public Health Association (APHA, 1999) whereas the depth, transparency and temperature have been measured on the spot. The obtained values of physico-chemical parameters have been compared with the criteria of World Health Organization (WHO) and other lakes. The research reveals that all the abiotic components of the Khaste Lake meet the WHO standard of water quality. This research work concludes that the water quality of Khaste Lake is much less polluted and suitable for all the aquatic lives so far. Discharge of domestic sewage, use of fertilizers and pesticides in agriculture fields and other solid waste dumps can be the major threats for sustainability of the lakes. Awareness to the public and continual management need to be done to prevent the possibility of pollution and eutrophication process.

scholarly journals Study Comparative of Corrosion Rate Scrap Aluminium in Chloride Acid (HCl) and Natrium Chloride (NaCl) Solutions

2020 ◽  
Vol 331 ◽  
pp. 05004
Author(s):  
Muhammad Zuchry ◽  
Anjar Asmara ◽  
Naharuddin Naharuddin ◽  
Yandi Yandi
Keyword(s):  
Weight Loss ◽  
Sodium Chloride ◽  
Corrosion Rate ◽  
Automotive Industry ◽  
Immersion Time ◽  
Large Scale ◽  
Chloride Ions ◽  
Raw Material ◽  
Small Scale ◽  
Household Appliances

Scrap aluminium is waste aluminium, the result of recycling that can be used as an alternative raw material with consideration of cheap and affordable prices. The use of aluminium scrap has been widely used both on a large scale such as the automotive industry, ships, aircraft, construction, etc., as well as on a small scale such as household appliances. Chloride acid is used in the process of purifying salt, cleaning porcelain, and as a stain remover on kitchen utensils, and sodium chloride, known as salt, is very corrosive due to the presence of chloride ions. The corrosive nature of chloride ions can be influenced by the concentration and duration of immersion, so it is necessary to research changes in the corrosion rate caused by the concentration and time of immersion. This study uses a method of immersion with weight loss where the specimen is immersed in HCl and NaCl with a concentration of 0. 1%; 0. 3%; and 0. 5% with an immersion time of 5 days, 10 days and 15 days. The results showed that the highest corrosion rate of HCl occurred at 15 days immersion with a concentration of 0. 1% at 1542. 314 Mpy, and the smallest corrosion rate at 5 days with a concentration of 0. 5% at 181. 09 Mpy. For the largest NaCl corrosion rate occurred at 15 days immersion with a concentration of 0. 1% from 101. 171 Mpy, and the smallest corrosion rate at 5 days immersion with a concentration of 0. 5% 41. 793 Mpy.

Study on the Chemical Modification Process of Jute Fiber

TAPPI Journal ◽  
2010 ◽  
Vol 9 (2) ◽  
pp. 23-29 ◽  
Author(s):  
Wei-ming Wang ◽  
Zai-sheng Cai ◽  
Jian-yong Yu
Keyword(s):  
Sodium Hydroxide ◽  
Sodium Silicate ◽  
Treatment Time ◽  
Jute Fiber ◽  
Process Conditions ◽  
Silicate Concentration ◽  
Sodium Hydroxide Concentration ◽  
Liquor Ratio ◽  
Degumming Process ◽  
Selection Of

Degumming of pre-chlorite treated jute fiber was studied in this paper. The effects of sodium hydroxide concentration, treatment time, temperature, sodium silicate concentration, fiber-to-liquor ratio, penetrating agent TF-107B concentration, and degumming agent TF-125A concentration were the process conditions examined. With respect to gum decomposition, fineness and mechanical properties, sodium hydroxide concentration, sodium silicate concentration, and treatment time were found to be the most important parameters. An orthogonal L9(34) experiment designed to optimize the conditions for degumming resulted in the selection of the following procedure: sodium hydroxide of 12g/L, sodium silicate of 3g/L, TF-107B of 2g/L, TF-125A of 2g/L, treatment time of 105 min, temperature of 100°C and fiber to liquor ratio of 1:20. The effect of the above degumming process on the removal of impurities was also examined and the results showed that degumming was an effective method for removing impurities, especially hemicellulose.

Fluctuations of Annual Precipitation and Water Resources Quality in Ukraine

2016 ◽  
Vol 10 (4s) ◽  
pp. 621-629
Author(s):  
Valentina Pidlisnyuk ◽  
◽  
John Harrington JR ◽  
Yulia Melnyk ◽  
Yuliya Vystavna ◽  
...  
Keyword(s):  
Water Resources ◽  
Surface Waters ◽  
Precipitation Amount ◽  
Ion Concentration ◽  
Annual Precipitation ◽  
Resource Quality ◽  
Phosphate Ion ◽  
Regional Trends

The article focuses on examining the influence of fluctuations in annual precipitation amount on the quality of surface waters. Water quality was estimated with data on BOD, COD and phosphate–ion concentration within five selected regions of Ukraine. Analysis of the precipitation data (1991 – 2010) showed different regional trends. Using the statistics, determination of the interconnection between precipitation amount and water resources quality were done. The obtained regularities and associated uncertainties can be used for prediction of changes in water resource quality and as a guide for future adaptation to possible climate change.

Hydro-geochemical properties with respect to landuse in the southernmost river of Kerala

2018 ◽  
Vol 6 (1) ◽  
Author(s):  
Badusha M. ◽  
Santhosh S
Keyword(s):  
Organic Carbon ◽  
Drainage Basin ◽  
Anthropogenic Activities ◽  
Oxygen Demand ◽  
Ion Concentration ◽  
Total Hardness ◽  
Hydrogen Ion Concentration ◽  
Geochemical Properties ◽  
Quality Of Water

The hydro geochemical features of Neyyar River for a period of one year from May 2015 to April 2016 were analyzed. Six sampling sites were fixed considering physiography and present landuse pattern of the river basin. The residents in the drainage basin are primarily responsible for framing a better landuse and thereby maintain a good water and sediment regime. Geospatial pattern of the present landuse of the study area indicated that the sustainability of this river ecosystem is in danger due to unscientific landuse practices, which is reflected in the river quality as well. The parameters such as hydrogen ion concentration, electrical conductivity, chloride, Biological Oxygen Demand, total hardness and sulphate of river water and Organic Carbon of river bed sediments were analyzed in this study. The overall analysis shows that the highland areas are characterized by better quality of water together with low organic carbon, which is mainly due to better landuse and minimal reclamation. The midland and lowland areas are characterized by poor quality of water with high organic carbon, which is due to high anthropogenic activities and maximum pollutants associated with the region together with the alteration in landuse from a traditional eco-friendly pattern to a severely polluted current pattern.

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