scholarly journals Effects of Surface Preparation on the Corrosion Behavior of Mild Steel

2021 ◽  
Vol 29 (1) ◽  
pp. 16-25
Author(s):  
Wasiu Ayoola ◽  
Stephen Durowaye ◽  
Kenneth Andem ◽  
Olujide Oyerinde ◽  
Jesutofunmi Ojakoya
Keyword(s):  
Quantitative Analysis ◽  
Corrosion Rate ◽  
Mild Steel ◽  
Corrosion Behavior ◽  
Potentiodynamic Polarization ◽  
Surface Preparation ◽  
Uncoated Sample ◽  
Engineering Materials ◽  
Subsequent Failure ◽  
Effect Of Surface

Surface preparation of engineering materials is necessary for preventing corrosion and subsequent failure of materials in service. There are different methods of surface preparations that can affect engineering materials in different ways. This study investigated the effect of surface preparation on the corrosion behavior of zinc sprayed and unsprayed mild steel. Quantitative analysis and potentiodynamic polarization techniques were used to evaluate the immersed samples of different surface preparations. The results indicated that the least corrosion rate was observed for the uncoated sample prepared with CC1200 grit paper at 0.041 mpy and successive samples in the order of CC220 grit paper at 0.047 mpy < P60 grit paper at 0.052 mpy < filing at 0.064 mpy and grinding at 0.074 mpy after 42-days of immersion. The prepared samples that were further coated with zinc spray demonstrated a similar trend. The sample prepared with CC1200 grit paper and further coated with zinc spray exhibited the lowest corrosion rate of 1.35 x 10-9 mpy. Potentiodynamic polarization results further suggested that the same behavior was observed in the quantitative analysis.

Potentiodynamic Polarization of Brass, Stainless and Coated Mild Steel in 1M Sodium Chloride Solution

2016 ◽  
Vol 23 ◽  
pp. 1-6 ◽  
Author(s):  
Olayide Rasaq Adetunji ◽  
Onwuka O. Ude ◽  
Sidikat I. Kuye ◽  
Enock O. Dare ◽  
Kamol O. Alamu ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Sodium Chloride ◽  
Corrosion Rate ◽  
Mild Steel ◽  
Potentiodynamic Polarization ◽  
Electrochemical Reaction ◽  
Open Circuit ◽  
Before And After ◽  
The Media ◽  
Current Densities

Enormous funds are spent on the protection of engineering components and structures annually as a result of corrosion. Degradation sets in, due to electrochemical reaction that takes place between materials and the environment leading to reduced performance. The associated downtime caused by replacement and maintenance of vessels, pipes, valves and other equipment necessitated seeking for techniques and method to efficiently combat corrosion. This study evaluated the potentiodynamic polarization of brass, Coated Mild Steel (CMS) and Stainless Steel (SS) in sodium chloride (NaCl). The samples (1 x 30 x 30 mm3) were used as working electrodes for Potentiodynamic Polarization Experiment (PPE). The samples were cleaned, and soaked in 1M NaCl solution. Open circuit potentials and current densities of the samples were obtained from PPE which were used to evaluate their corrosion rates. The pH of the media was recorded before and after each experiment. The results obtained using PPE in NaCl (in mm/y) were 0.209, 0.0053 and 0.0046; for brass, MSC and SS respectively. The pH of the medium was measured as 10.9.The results revealed that brass had highest corrosion rate in the medium. The least corrosion rate was obtained for Stainless Steel in 1M NaCl followed by Coated Mild Steel.

Corrosion Behavior of Al-Sn-Bi Alloys in Ethylene Glycol-Water Mixtures

CORROSION ◽  
2012 ◽  
Vol 68 (5) ◽  
pp. 421-431
Author(s):  
J.L. Gama-Ferrer ◽  
J.G. Gonzalez-Rodriguez ◽  
I. Rosales ◽  
J. Uruchurtu
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Corrosion Rate ◽  
Ethylene Glycol ◽  
Corrosion Behavior ◽  
Potentiodynamic Polarization ◽  
Electrochemical Noise ◽  
Electrochemical Impedance ◽  
Electrochemical Techniques ◽  
Potentiodynamic Polarization Curves

A study of the effect of Sn (1, 2, 3.5, 4.5, and 5 wt%) and Bi (0.5, 1.5, 3, and 4%) on the corrosion behavior of Al in ethylene glycol (C2H6O2)-40% water mixtures at 20, 40, and 60°C has been carried out using electrochemical techniques. Techniques include potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS), and electrochemical noise (EN) measurements. The three techniques have shown that additions of either Sn or Bi contents increased the corrosion rate of pure Al in all cases, and that generally speaking, the corrosion rate increased by increasing the temperature except for the alloy containing 1% Sn + 4% Bi, which showed the lowest corrosion rate at 60°C. This was because of a galvanic effect from the presence of Sn and/or Bi particles on the surface alloy, which acted as local cathodes, leading to an acceleration of corrosion. Nyquist diagrams showed two semicircles at 20°C and only one at 40°C or 60°C for all the alloys, showing two different corrosion-controlling mechanisms. EN measurements showed evidence of a mixture of both localized and uniform types of corrosion for all Al-based alloys.

Corrosion Behavior of Pb-Ca-Sn Electrodes for Copper Electrowinning

2011 ◽  
Vol 402 ◽  
pp. 349-353
Author(s):  
Xue Tao Yuan ◽  
Xu Dong Lv ◽  
Zhi Qiang Hua ◽  
Lei Wang ◽  
Tao Li
Keyword(s):  
Corrosion Rate ◽  
Ternary Alloy ◽  
Corrosion Behavior ◽  
Current Density ◽  
Potentiodynamic Polarization ◽  
Electrode Surface ◽  
Anodic Polarization ◽  
Polarization Measurements ◽  
Copper Electrowinning ◽  
Sn Anode

Anodic polarization behavior of ternary alloy Pb-0.08%Ca-1%Sn is studied by potentiodynamic polarization measurements, corrosion rate, the products on electrode surface after polarization, and microstructure of anode mud after polarization in electrowinning cell. The results show that Pb-Ca-Sn anode is easy to be passivated in electrolyte for copper electrowinning, the maintaining passivity current density is 97.72 µA•cm-2and the corrosion products on the surface of Pb-Ca-Sn electrode present loose scaly, being composed of α-PbO2, β- PbO2and PbSO4after polarization.

scholarly journals ELECTROCHEMICAL STUDIES FOR CORROSION INHIBITION OF MILD STEEL BY CHRYSOPHYLLUM ALBIDUM EXTRACT

2018 ◽  
Vol 6 (1) ◽  
pp. 415-420
Author(s):  
Akoma Chigozie ◽  
Osarolube Eziaku ◽  
Abumere O. E.
Keyword(s):  
Corrosion Rate ◽  
Mild Steel ◽  
Current Density ◽  
Potentiodynamic Polarization ◽  
Mixed Type ◽  
Inhibition Efficiency ◽  
Electrochemical Studies ◽  
Polarization Technique ◽  
Carbonated Drinks

The corrosion behavior of mild steel in carbonated drinks produced by Nigerian Breweries (Fanta, Sprite and Coke) was studied in the presence and absence of an eco-friendly inhibitor, Chrysophyllum albidum using Potentiodynamic polarization technique at 25 °C. Results showed that Chrysophyllum albidum reduced the current density (icorr), which in turn means that the corrosion rate was reduced significantly. The inhibition efficiency was found to be 93%, 78.6% and 87.5% for Fanta, Sprite and Coke respectively. The study also showed that Chrysophyllum albidum functioned as a mixed-type corrosion inhibitor in the three environments studied and therefore presents it as a long-term inhibitor for the corrosion of mild steel.

Corrosion Behavior of Super Austenitic Stainless Steel 904L Weldment in Sulfuric Acid Media Used for Leaching Application

2020 ◽  
Vol 835 ◽  
pp. 384-391 ◽  
Author(s):  
Gamal M. Rashed ◽  
Waleed A. Mohrez ◽  
Abd Allah M. Abd El-Hamid ◽  
Ibrahim M. Ghayad
Keyword(s):  
Weight Loss ◽  
Sulfuric Acid ◽  
Corrosion Rate ◽  
Acid Solution ◽  
Corrosion Behavior ◽  
Potentiodynamic Polarization ◽  
Total Immersion ◽  
Polarization Test ◽  
Super Austenitic Stainless Steel ◽  
Leaching Medium

This article reports the corrosion behavior of 904L weldment in sulfuric acid as a strong corrosive media. The corrosion behavior was studied by total immersion tests and potentidynamic polarization test. Total immersion test has been conducted at different acid concentrations typically: 1, 2, 4, 6, 8 and 18.4 M at 25°C. The effect of temperature (25- 100°C) on the weight loss measurements of the alloy samples was followed in the 4 M acid solution. On the other hand, potentiodynamic polarization tests were conducted in 2,5, 8 and 18.4 M H2SO4 solution. The potentiodynamic polarization test was also conducted in the practically used leaching medium (2 M H2SO4 + 10% monazite).Results show that the weight loss increases with the increase of acid concentration and reaches its maximum at 4 M H2SO4 and then gradually decreases. Meanwhile, the rise in temperatures results in the increase of weight loss. Potentiodynamic polarization tests indicate that the 5 M acid solution gives the highest corrosion rate of 0.6399 mm/Y. The leaching medium shows relatively higher corrosion rate (0.124 mm/y) than the corresponding 2 M H2SO4 without monazite (0.01712 mm/y).

Influence of Alternating Current on Corrosion of Mild Steel: Behavior in 1 N Sulfuric Acid

CORROSION ◽  
1967 ◽  
Vol 23 (9) ◽  
pp. 264-267 ◽  
Author(s):  
A. R. YAMUNA ◽  
N. SUBRAMANYAN
Keyword(s):  
Sulfuric Acid ◽  
Corrosion Rate ◽  
Mild Steel ◽  
Corrosion Behavior ◽  
Alternating Current ◽  
High Current ◽  
Qualitative Explanation

Abstract Corrosion behavior of mild steel in 1 N sulfuric acid subject to alternating currents in the range 250 micro-amp to 100 mA cm−2 at frequencies varying from 30 to 1000 cps is reported. It was found that at low current values, the corrosion rate increases with frequencies up to 200 cps, but diminishes with frequencies above this rate. At relatively high current values, the corrosion rate decreases with increasing frequencies. A qualitative explanation of the observations is suggested.

Studies on the Influence of Chloride Ion Concentration on the Corrosion Behavior of ZSMX Magnesium Alloy

2010 ◽  
Vol 95 ◽  
pp. 47-50 ◽  
Author(s):  
Guy Ben-Hamu ◽  
D. Eliezer ◽  
Kwang Seon Shin
Keyword(s):  
Magnesium Alloy ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Potentiodynamic Polarization ◽  
Electrochemical Behavior ◽  
Chloride Ion ◽  
Ion Concentration ◽  
Experimental Techniques ◽  
Nacl Solution ◽  
Wrought Magnesium Alloy

The paper presented reveals the influence of chloride ion concentration on the corrosion and electrochemical behavior of new ZSMX wrought magnesium alloy in NaCl solution. The experimental techniques used include potentiodynamic polarization tests. The corrosion rate usually increased with the increase in chloride ion concentration. This result can be explained by the distribution of intermetalics.

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