Study on Anti-Corrosion Behaviour of 304 Stainless Steel in Circulating Cooling Water

2012 ◽  
Vol 511 ◽  
pp. 74-77
Author(s):  
Yu Chun Li ◽  
Ya Jiang ◽  
Heng Zheng ◽  
Kang Juan ◽  
Xiao Wei Liu
Keyword(s):  
Weight Loss ◽  
Stainless Steel ◽  
Concentration Ratio ◽  
Corrosion Behaviour ◽  
Cooling Water ◽  
304 Stainless Steel ◽  
Circulating Cooling Water ◽  
Weight Loss Method ◽  
Ratio Condition ◽  
Loss Method

Abstract: The corrosion behaviour of 304SS in cooling water was studied through weight-loss method and electrochemistry measurements in different concentration ratio condition. The results obtained from this study showed that 304SS material was anti-corrosive with inhibitor when concentration ratio of circulating cooling water was 3 ~ 10, especially in CR 10 condition, and the advised CR running range was 3~10.

Study on Corrosion Resistance of Brass in Circulating Cooling Water with Different Concentration Ratio

2012 ◽  
Vol 511 ◽  
pp. 70-73
Author(s):  
Yu Chun Li ◽  
Xiao Wei Liu ◽  
Rui Feng Zhang ◽  
Kang Juan ◽  
Fan Gao
Keyword(s):  
Weight Loss ◽  
Corrosion Resistance ◽  
Concentration Ratio ◽  
Water System ◽  
Cooling Water ◽  
Cooling Water System ◽  
Circulating Cooling Water ◽  
Weight Loss Method ◽  
Ratio Condition ◽  
Loss Method

Abstract: The corrosion resistance of brass H70-1A cooling water was studied through weight-loss method and electrochemistry measurement in different concentration ratio condition. The results obtained from this study showed that brass inhibitor was necessary to add to circulating cooling water system when concentration ratio was in the range of 3~7.

Study on Anti-Corrosion Performance of 20A & 316SS in Circulating Cooling Water with Different Concentration Ratio

2012 ◽  
Vol 549 ◽  
pp. 753-756
Author(s):  
Ding Ping Zhong ◽  
Kang Juan ◽  
Fan Gao ◽  
Heng Zheng
Keyword(s):  
Weight Loss ◽  
Carbon Steel ◽  
Concentration Ratio ◽  
Corrosion Behaviour ◽  
Cooling Water ◽  
Corrosion Performance ◽  
Circulating Cooling Water ◽  
Ratio Condition ◽  
Effective Role ◽  
Positive Effect

The corrosion behaviour on 20A carbon steel and 316SS in cooling water were studied through weight-loss measurements in different concentration ratio condition. The results obtained from this study showed that inhibitors played obviously effective role for 20A material, while inhibitors had no any positive effect to 316SS material; and concentration ratio 3~7 range was suitable for protecting both 20A and 316SS materials in power plant.

Corrosion Behaviour of Aluminium Alloy in Palm Oil Methyl Ester (B100)

2012 ◽  
Vol 58 (2) ◽  
Author(s):  
W. B. Wan Nik ◽  
S. Syahrullail ◽  
R. Rosliza ◽  
M. M. Rahman ◽  
M. F. R. Zulkifli
Keyword(s):  
Weight Loss ◽  
Methyl Ester ◽  
Corrosion Rate ◽  
Aluminium Alloy ◽  
Palm Oil ◽  
Corrosion Behaviour ◽  
Corrosion Current ◽  
Electrochemical Test ◽  
Weight Loss Method ◽  
Loss Method

The aim of this study is to determine the corrosion effect of palm oil methyl ester (POME) on aluminium alloy 5083 (AA5083). The static immersion test was carried out at 60°C for 68 days according to ASTM G–31–72. The corrosion analysis was done by using weight loss method and electrochemical test. The result from weight loss method shows the decreasing in weight loss of AA5083 which signifies the ability of POME to reduce corrosion rate. The electrochemical test shows the decreasing in polarization resistance,Rp, while the corrosion current densities, Icorr, increase. The corrosion rate reduces from 2.250mpy to 0.1946mpy. The low concentration of fatty acid C18:2 and high anti oxidant element contributes to the reduction of corrosion rate of AA5083 in POME.

Study on the Complex of Sodium Tungstate and Urotropine as Inhibitors against Stainless Steel Corrosion in the NaCl Solution

2011 ◽  
Vol 689 ◽  
pp. 450-454 ◽  
Author(s):  
Qiang Song ◽  
Xing Qi Qiu
Keyword(s):  
Stainless Steel ◽  
Sodium Tungstate ◽  
Total Concentration ◽  
Steel Corrosion ◽  
Inhibitory Effect ◽  
304 Stainless Steel ◽  
Nacl Solution ◽  
Weight Loss Method ◽  
Synergistic Inhibitory Effect ◽  
Loss Method

The corrosion weight loss method and polarization curve measurement were conducted to study the effects of the complex inhibitor of sodium tungstate and urotropine on the corrosion of 304 stainless steel in the 3.5% NaCl solution. The results indicated that the complex inhibitor has good synergistic inhibitory effect for stainless steel in the NaCl solution. Combining sodium tungstate and urotrpine at a total concentration of 500 mg/L, when the mass ratio of sodium tungstate to urotrpine was 7:3, the inhibitory effect was optimum. In addition, the probable inhibitory mechanism was analyzed.

scholarly journals Organic Phosphorus Compounds as Inhibitors of Corrosion of Carbon Steel in Circulating Cooling Water: Weight Loss Method and Thermodynamic and Quantum Chemical Studies

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Liang Liu ◽  
Ting-Ting Cao ◽  
Qi-Wei Zhang ◽  
Chong-Wei Cui
Keyword(s):  
Carbon Steel ◽  
Corrosion Inhibition ◽  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Organic Phosphorus ◽  
Cooling Water ◽  
Circulating Cooling Water ◽  
Weight Loss Method ◽  
Corrosion Inhibition Efficiency ◽  
Loss Method

Circulating cooling water plays an important role in industrial water use. In this study, the corrosion inhibition effects of PBTCA, HEDP, and ATMP organic phosphorus inhibitors were investigated using the weight loss method by varying the dosage of inhibitors, ClO2 concentrations, and pH values on carbon steel in recirculating cooling water with a low concentration of ClO2 solution. The results showed that the three corrosion inhibitors had a satisfactory corrosion inhibition effect and that corrosion inhibition efficiency is positively correlated with the concentration of organic phosphorus inhibitors and pH. The average corrosion inhibition efficiency of the three inhibitors was about 80% at the concentration of inhibitors = 35 mg/L, pH = 9.0, and the concentration of ClO2 = 7.0 mg/L, of which the single-phosphorus molecular corrosion inhibitor proved to be the best inhibitor. When the ClO2 concentration was 7 mg/L, the corrosion inhibition efficiencies of the three corrosion inhibitors were relatively stable. Using the density functional theory (DFT) algorithm in the Gaussian 09 program, the optimization calculation was completed by the B3LYP/6-31G (d, p) method at the microlevel. The molecular structures of the three organic phosphorus inhibitors and the number of phosphorus-containing atoms were compared to the sustained-release properties. Organic phosphorus inhibitors, as an electronic buffer, not only provided electrons but also received electrons. They formed a complex with iron and zinc ions in water in order to attach to the surface of the carbon steel and to alleviate corrosion. In addition, the adsorption with a metal surface followed the Langmuir adsorption isotherm.

Corrosion of 434 Stainless Fibres in Hydrochloric Acid

2013 ◽  
Vol 318 ◽  
pp. 312-315
Author(s):  
Xiong Yang ◽  
Jian Tong ◽  
Xiao Ming Li
Keyword(s):  
Weight Loss ◽  
Stainless Steel ◽  
Hydrochloric Acid ◽  
Corrosion Rate ◽  
Etching Time ◽  
Direct Part ◽  
Steel Fibres ◽  
Corrosion Rates ◽  
Weight Loss Method ◽  
Loss Method

The effects of concentration and temperature of hydrochloric acid and etching time on the corrosion rates of 434 stainless steel fibres are investigated by using weight loss method,The results show that with the concentration of hydrochloric acid increase,the temperature of hydrochloric acid rise, etching time prolonging, the corrosion rate of 434 stainless steel fibres is increased, and the corrosion rate of smalldimension of 434 stainless steel fibres faster.Though Cl- of hydrochloric acid doesn’t take direct part in the reaction,the corrosion rate is significantly accelerated.

Effect of Amino Acids on the Corrosion of Steel in Sulfuric Acid Solutions

2011 ◽  
Vol 239-242 ◽  
pp. 3142-3145
Author(s):  
Xin Hua Liu ◽  
Qing Hui Wang ◽  
Yu Lan Rui
Keyword(s):  
Amino Acids ◽  
Weight Loss ◽  
Sulfuric Acid ◽  
Phase Angle ◽  
Potentiodynamic Polarization ◽  
Corrosion Behaviour ◽  
Ac Impedance ◽  
Weight Loss Method ◽  
Loss Method ◽  
Sulfuric Acid Solutions

The influence of amino acids on the corrosion behaviour of steel in H2SO4solutions was studied by potentiodynamic polarization, AC impedance and weight-loss. The Potentiodynamic polarization curve results show that compound amino acids are mixed-type inhibitors which inhibit the reactions of anode and cathode; AC impedance results show that the ternary complex inhibitors have a good synergistic effect and high corrosion rate which can be proved by Resistance (Rt), double-layer capacitance (Cdl), Resistance modulus(︱Z︱), and phase angle from the Nyquist chart, Bode chart and phase angle chart. The weight-loss method show that the corrosion efficiency of composite amino acids are over 90% in 0-16 hours, 30-50°Cand 0.4-2.0mol / L sulfuric acid.

The Synergistic Effect of Thiourea and Surfactants on Corrosion Inhibition of Stainless Steel-316 in Hydrochloric Acid

2014 ◽  
Vol 917 ◽  
pp. 28-34 ◽  
Author(s):  
Sami Ullah ◽  
Muhammad Nadeem ◽  
Mohd Shariff Azmi ◽  
Faiz Ahmad ◽  
Shaukat Ali Shahid ◽  
...  
Keyword(s):  
Weight Loss ◽  
Stainless Steel ◽  
Synergistic Effect ◽  
Corrosion Inhibition ◽  
Raw Materials ◽  
Sodium Dodecyl ◽  
Ammonium Bromide ◽  
Weight Loss Method ◽  
Loss Method ◽  
Stainless Steel 316

Corrosion and scaling are the common problems to all the industries. A remedy of these problems was sought out through chemical treatment: indigenously available raw materials including thiourea, surfactants (cationic, anionic and nonionic containing pre, critical and post micellar concentration). Evaluation of corrosion inhibition properties stainless steel 316 by thiourea based inhibitor and its synergistic effect with cationic cetyl tri-methyl ammonium bromide (CTAB), anionic sodium dodecyl sulphate (SDS) and nonionic triton X-100 have been carried out by weight loss method as a function of concentration of thiourea and surfactants. These materials were applied to the coupons of stainless steel 316 in different acidic concentration. Corrosion rates were calculated using weight loss method. Excellent results were achieved regarding corrosion inhibition in the presence of thiourea and surfactants assuring the better performance of these chemicals. The results showed that corrosion rate was decreased from 90 mpy to 12.1 mpy after 720 hours by the addition of 200ppm thiourea in critical micellar concentration of SDS in 3M HCl acid solution.

A Note on Groove Depth Changes Without Wear

1980 ◽  
Vol 8 (1) ◽  
pp. 10-12
Author(s):  
F. C. Brenner
Keyword(s):  
Weight Loss ◽  
Wear Test ◽  
Groove Depth ◽  
High Rate ◽  
Weight Changes ◽  
Wear Rates ◽  
Weight Loss Method ◽  
Loss Method ◽  
And Storage ◽  
Low Rate

Abstract Tread wear rates during first wear measured by groove depth and weight changes do not always agree. Sometimes, the groove depth method shows a high rate and the weight loss method a low rate. Reported here are experiments designed to determine if grooves show depth changes without wear. Four tires were measured before mounting on a wheel, after mounting and inflation, and after inflation and storage. The mounted and inflated tires showed shallower shoulder grooves and deeper center grooves than the unmounted tires. In a second experiment, tires were measured immediately after a tread wear test and then stored mounted for two weeks before remeasuring. Each groove became deeper, and there was no change in the crown radius of any tire.

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