Effect of Antimony on the Corrosion Resistance of Steel in Acid Solution with High Chloride Concentration

2012 ◽  
Vol 577 ◽  
pp. 109-114
Author(s):  
Shan Chen ◽  
Guo Ming Li ◽  
Xiao Yan Wang ◽  
Xue Qun Chen
Keyword(s):  
Corrosion Resistance ◽  
Acid Solution ◽  
Electrochemical Techniques ◽  
Chloride Concentration ◽  
Immersion Test ◽  
Test Results ◽  
Rust Layer ◽  
Layer Resistance ◽  
High Chloride Concentration ◽  
High Chloride

This study focused on the effect of antimony on the corrosion resistance of low alloy steel using electrochemical techniques such as dynamic scanning and EIS and immersion test in an acid solution with high chloride concentration. The potentiodynamic test showed the anodic and cathodic corrosion behavior of all specimens and the corrosion rate decreased with increasing antimony addition. EIS showed that the antimony-containing steels had higher rust layer resistance. These test results showed the addition of antimony was convenient to the enhancement of corrosion resistance of the steel in the acid solution with high chloride concentration. The tests proved that the content of antimony controlled to 0.12% in the steel showed the best corrosion resistance.

Saving of Water and Chemicals in Tanning Industry by Membrane Processes

1999 ◽  
Vol 40 (4-5) ◽  
pp. 443-450 ◽  
Author(s):  
A. Cassano ◽  
R. Molinari ◽  
E. Drioli
Keyword(s):  
Waste Water ◽  
Reverse Osmosis ◽  
Concentrate Solution ◽  
Salt Content ◽  
Chloride Concentration ◽  
Chemical Precipitation ◽  
Chromium Concentration ◽  
High Salt Content ◽  
High Chloride Concentration ◽  
High Chloride

Some results on pressure-driven membrane operations able to improve chromium recovery from spent chromium tanning baths and to desalinate water discharged from filterpress after Cr(III) precipitation are reported. Nanofiltration was employed to concentrate chromium(III) using a spiral-wound module. Chromium concentration and COD in permeate were respectively about zero and 2–3 g/l as compared to initial feed values of 2.8 and 5.2 g/l; the high chloride concentration in the permeate suggested to reuse this solution in the pickling step saving fresh water and salts. The concentrate solution presented a higher chromium purification with respect to initial feed. It was tested in retanning, and after further concentration by chemical precipitation-dissolution method, in tanning operations. Chemical and physical analyses on leather treated with these solutions showed similar characteristics with respect to use of traditional chromium solution. Reverse osmosis was employed to reduce the high salt content in waste water from filter pressing of chromium hydroxide panels. Good rejection of reverse osmosis membrane to chloride and sulphate ions suggested the use of this operation for obtaining water, to be used in washings, or to sent to biological treatment of final waste water.

Comparative Study of Microstructural and Corrosion Characteristics of Excimer Laser-Melted AA2124-T4 and AA6061-T4 Alloys

2014 ◽  
Vol 794-796 ◽  
pp. 235-240 ◽  
Author(s):  
Dai Shu Qian ◽  
Zhu Liu
Keyword(s):  
Corrosion Resistance ◽  
Excimer Laser ◽  
Corrosion Behaviour ◽  
Electrochemical Techniques ◽  
Compositional Analysis ◽  
Laser Pulses ◽  
Immersion Test ◽  
Nacl Solution ◽  
Intermetallic Particles ◽  
Melted Layer

A KrF excimer laser was introduced for laser surface melting (LSM) of the aluminium alloys AA2124-T4 and AA6061-T4. The microstructural and compositional analysis was conducted using SEM, low-angle XRD, and TEM; the corrosion behaviour of as-received (AR) and laser-treated (LT) samples was evaluated by electrochemical techniques and immersion test in a 3.5% NaCl solution. A melted layer consisting of a re-solidified layer with refined microstructure and dissolution of intermetallic particles (IMPs), and a thin film of aluminium oxides at the top, was formed after LSM for both alloys. The corrosion resistance of both alloys was improved after LSM. The results of immersion test showed different corrosion behaviour for LT AA2124 and LT AA6061. The delamination of the melted layer was observed for AA2124 but was not observed for AA6061 after exposure to 3.5% NaCl solution for 24 h. This was attributed to the formation of copper-rich segregation bands in the melted layer of AA2124 due to higher content of copper in AA2124 than AA6061. A significant number of micro-pores were present in the melted layer for AA2124 treated with high number of laser pulses, leading to the decrease of the corrosion resistance.

scholarly journals PENERAPAN PERSAMAAN GEOTERMOMETER (SiO2)p DI LAPANGAN PANAS BUMI SULI, AMBON

2012 ◽  
Vol 6 (2) ◽  
pp. 33-36
Author(s):  
Helda Handayani
Keyword(s):  
Hot Springs ◽  
Hot Spring ◽  
Chloride Concentration ◽  
Hot Water ◽  
Reservoir Temperature ◽  
A Value ◽  
Calculation Results ◽  
High Chloride Concentration ◽  
Rms Error ◽  
High Chloride

Suli hot springs area has a low level of acidity or neutral pH ranges (7,2–7,7). It is also supported by a high chloride concentration value, which ranges (208,87-226,27) ppm. Thisshows that the area on station 1, 2, 3, and 4 are located in areas with water flow into the upper reservoir (upflow) and belongs to hot water domination reservoir tipe (water heatedreservoir). Reservoir temperature is calculated by the formula geotermometer (SiO2)p considered whether applied in the four kinds geotermometer equation because it gives the calculation results are not much different temperature and has a value of rms-error is less than 2%. Reservoir temperature at a hot springs station Suli possible temperature (161 ± 0,9)oC. Reservoir temperature at station 2 hot spring Suli possible hot water temperature (172 ± 1,0)oC. Reservoir temperature at station 3 hot springs Suli possible temperature (171 ±0,9)oC. Reservoir temperature at station 4 hot springs Suli possible temperature (169 ± 1,0)oC.

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