Corrosion Rates of Mild Steel in Coastal, Industrial, and Inland Areas of Northern California

2009 ◽  
pp. 83-83-12 ◽  
Author(s):  
HE Thomas ◽  
HN Alderson
Keyword(s):  
Mild Steel ◽  
Northern California ◽  
Corrosion Rates

Effect of pH on Oxygen Corrosion At Elevated Pressures

CORROSION ◽  
1960 ◽  
Vol 16 (6) ◽  
pp. 260t-264t ◽  
Author(s):  
O. L. RIGGS ◽  
J. D. SUDBURY ◽  
MERLE HUTCHISON
Keyword(s):  
Mild Steel ◽  
Oxygen Pressure ◽  
Pressure Range ◽  
Room Temperature ◽  
Accelerated Corrosion ◽  
Corrosion Rates ◽  
Elevated Pressures ◽  
Decreasing Ph ◽  
Ph Range ◽  
Mechanism Of Growth

Abstract A summary study of oxygen corrosion of mild steel in brine is presented. Corrosion rates were determined for oxygen pressures ranging from atmospheric to 515 psia and over a pH range of 1-13.5. All tests were conducted at room temperature (24 C). It is shown that corrosion rates are generally increased with increasing oxygen pressure and decreasing pH; however, when tests exceeded 6 hours duration, an accelerated corrosion developed over the pH range 8–12. An unusual filamentary type corrosion product develops and grows in the 300–500 psi oxygen pressure range in pH 12 system. The identification and proposed mechanism of growth are given. 3.4.6

scholarly journals High Temperature Effectiveness of Ginger Extract as Green Inhibitor for Corrosion in Mild Steel

2019 ◽  
Vol 11 (1) ◽  
pp. 26-32 ◽  
Author(s):  
Muhammad Sohail ◽  
Fayaz Hussain ◽  
Ali Dad Chandio ◽  
Maryam Sheikh
Keyword(s):  
Corrosion Rate ◽  
Mild Steel ◽  
Room Temperature ◽  
Corrosion Inhibitors ◽  
Raw Material ◽  
Ginger Extract ◽  
Green Inhibitor ◽  
Ambient Temperatures ◽  
Linear Polarization Resistance ◽  
Corrosion Rates

Corrosion is one of the major problems of mild steels in acidic medium. This can be minimized by the application of corrosion inhibitors, however; the most of inhibitors are toxic in nature. Therefore inhibitors from green sources are highly desirable to maintain the sustainability of the environmental system. Consequently, in this study ginger was selected; its juice extracted mechanically and used as an inhibitor. The different concentrations of ginger extract such as 0.25ml, 0.5ml, 0.75ml and 1ml were mixed in 0.1 M HCl solution to record the effect of inhibitor on corrosion rate at room temperature and at an elevated temperature of 50ᵒC. Electrochemical linear polarization resistance (LPR) tests were carried out to determine the corrosion rates at both temperatures with different additions of the inhibitor respectively. The LPR test uses three electrodes, first electrode of AISI 1019 (mild steel), second electrode is standard electrode of saturated calomel while the third electrode consists of graphite, which is called counter electrode, to measure potential difference. The whole assembly was dipped in the solution having varying concentration of inhibitors. The corrosion rate was found to be higher in the absence of ginger- extract. Conversely, the corrosion rate was dramatically reduced more prominently at 50oC but was less effective at Troom; with the trace-additions of ginger-inhibitor. So this research would be the good contribution to overcome the deterioration of mild steel and increase its life at ambient temperatures, by using economically available environmentally-friendly organic compound specially the use of locally available raw material should be focused.

Corrosion Rates of Mild Steel In NH4NO3-NH3-H2O Solutions★

CORROSION ◽  
1958 ◽  
Vol 14 (4) ◽  
pp. 57-59 ◽  
Author(s):  
NORMAN HACKERMAN ◽  
RAY M. HURD ◽  
EARL S. SNAVELY
Keyword(s):  
Corrosion Rate ◽  
Mild Steel ◽  
Sodium Arsenite ◽  
Reference Electrode ◽  
Effective Inhibitor ◽  
Corrosion Rates ◽  
Corrosion Reaction ◽  
Simple Potential

Abstract Corrosion rates of mild steel in mixtures of NH4NO3-NH3-H2O were measured at temperatures of 30, 45 and 60 C. The effects of various sulfur and arsenic-containing inhibitors were studied, with particular emphasis on NH4CNS. The corrosion reaction was found to be markedly affected by stresses in the metal to the extent that completely stress-relieved coupons would not corrode at all. The rate of the uninhibited reaction was much lower at 45 and 60 C than at 30 C, indicating a change in the mechanism of the corrosion reaction. The uninhibited corrosion rate of 3700 mdd at 30 C was decreased to approximately 25 mdd with NH4CNS concentrations greater than 0.1 percent. At 45 C, the most effective inhibitor was found to be 0.05 percent 2-mercapto-ethanol + 0.05 percent sodium arsenite, followed closely by 0.1 percent NH4CNS + 0.05 percent sodium arsenite. Thio-cyanate and thiourea alone at concentrations of 0.1 percent were somewhat less effective. Simple potential measurements using a platinum reference electrode showed the corroding coupons to be about 0.9 volt more anodic than the stress-relieved coupons. 4.3.4

CORROSION PROTECTION OF MILD STEEL AND ALUMINIUM IN 0.1M AND 1M HCL ACID SOLUTIONS USING PTEROCARPUS OSUN.

2020 ◽  
Vol 45 (4) ◽  
Author(s):  
G.J. Okore ◽  
E.U. Elenwoke ◽  
J.S. Okore ◽  
E.E. Oguzie
Keyword(s):  
Mild Steel ◽  
Inhibition Efficiency ◽  
Acid Solutions ◽  
Inhibition Effect ◽  
Langmuir Adsorption ◽  
Corrosion Rates ◽  
Mechanism Of Inhibition ◽  
Increase With Increase ◽  
Chemical Inhibitors ◽  
Stem Extract

The inhibition effect of Pterocarpus osun on the corrosion of mild steel and aluminium in acidic medium was studied using gravimetric techniques. Weight loss measurements were determined on metal coupons in 0.1M and 1M HCl acid within the immersion time of 24-h for 5 consecutive days. Inhibition efficiency was determined by comparing the corrosion rates of mild steel and aluminium in 0.1M and 1M HCl in the presence and absence of additives. The trend of inhibition efficiency was used to propose the mechanism of inhibition. It was found that the plant extract act as inhibitor for acid-induced corrosion of mild steel and aluminium in 0.1M and 1M HCl. Inhibition efficiency of 94.5% and 94.9% were obtained for P. osun for aluminium in 0.1M and 1M HCl and 98.9%and 96.9% for mild steel in 0.1M and 1M HCl respectively. The inhibition efficiency was found to increase with increase in inhibitor concentrations. The adsorption of the inhibitor obeyed Langmuir Adsorption Isotherm. Based on the findings, P. osun stem extract is highly recommended as an alternative to synthetic, toxic chemical inhibitors.

The role of drug as corrosion inhibitor for mild steel surface characterization by SEM, AFM, and FTIR

2016 ◽  
Vol 63 (4) ◽  
pp. 308-315 ◽  
Author(s):  
Md. Zaved Hossain Khan ◽  
Md. Abdul Aziz ◽  
Md. Rafiul Hasan ◽  
Md. Rashid Al-Mamun
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Mild Steel ◽  
Steel Surface ◽  
Content Type ◽  
Mild Steel Surface ◽  
Force Microscopy ◽  
Corrosion Rates ◽  
Atomic Force ◽  
Scanning Electron

Purpose The purpose of this study is to understand the inhibitor behavior of specific drug against mild steel corrosion and their adsorption mechanism on the surface. Design/methodology/approach Corrosion rates are influenced by the formation of inhibitor aggregates at the mild steel surface. Detail surface characterizations of mild steel have been studied before and after adsorption of drugs in 1N HCl solution. Scanning electron microscopy, atomic force microscopy and Fourier transform infrared spectroscopy were used to examine the effect of drug adsorption on steel surface. Findings Scanning electron microscopy analysis suggested that the metal had been protected from aggressive corrosion because of the addition of the inhibitors. Atomic force microscopy visualization confirmed the formation of protective layer on steel surface, resulting in the decrease in surface roughness with corrosion rates. The nature of metal surface has been analyzed by Fourier transform infrared spectroscopy. Originality/value The findings of this study will help us to understand the interaction of specific drugs with mild steel surface and their potential inhibition mechanism.

scholarly journals Investigating the Inhibitive Characteristics of Moringa Oleifera on the Corrosion of Mild Steel

2021 ◽  
Vol 9 (9) ◽  
pp. 595-602
Author(s):  
Okpaga D. M
Keyword(s):  
Weight Loss ◽  
Corrosion Rate ◽  
Mild Steel ◽  
Immersion Time ◽  
Moringa Oleifera ◽  
Inhibition Efficiency ◽  
Sodium Hydroxide Solution ◽  
Total Surface Area ◽  
Corrosion Rates ◽  
Very High

Abstract: This work deals with the inhibitive characteristics of Moringa oleifera fruits and leaves extracts in Hydrochloric Acid solution and Sodium Hydroxide solution respectively on the corrosion of mild steel. This was carried out using weight loss and polarization techniques. The effects of immersion time, the effect of acid and alkaline concentration on the corrosion behavior of mild steel in 1.0M HCl and 1.0 NaOH with addiction of extracts were deduced. The fruits which were dried and grounded to powder of 10g and the leaves which range from 25cm3 to 100cm3 were used for this study. The corrosion rate was very high in the absence of inhibitors (Moringa oleifera fruits and the leaves extracts). The mild steel was cut into coupon averaging a total surface area of 4.262cm2 . The sample was weighed and immersed into a beaker containing 1.0M NaOH with different volumes of moringa leaves and 1.0M HCl with 10g dried concentrated powdered moringa fruits with coupons removed every 7 days for weight loss measurements till 4 weeks. The corrosion rates were found to be decreased by 83% in 1.0M HCl and 78% in 1.0M NaOH respectively, values of inhibition efficiency (ࣁ (%were calculated from weight loss. The results obtained showed that the Moringa oleifera fruits and leaves extracts could serve as effective inhibitors on the corrosion of mild steel in HCl and NaOH respectively. Keywords: Moringa oleifera, Corrosion rate, Weight loss, Mild steel, Inhibitor.

An Electrochemical-Statistical Study of Mild Steel Corrosion Inhibition in Oxygen Containing Environments

CORROSION ◽  
1971 ◽  
Vol 27 (10) ◽  
pp. 418-423 ◽  
Author(s):  
R. A. LEGAULT ◽  
S. MORI ◽  
H. P. LECKIE
Keyword(s):  
Mild Steel ◽  
Passive Film ◽  
Competitive Adsorption ◽  
Environmental Changes ◽  
Steel Corrosion ◽  
Dissolution Behavior ◽  
Film Stability ◽  
Corrosion Rates ◽  
Mild Steel Corrosion ◽  
Chemical Inhibitors

Abstract The dissolution behavior of mild steel in a given environment is related to the competitive adsorption of available species onto the metal surface. The nature of the adsorbed species determines the direction in which the dissolution behavior is altered. An earlier study described the effect of chemical inhibitors in oxygen-free environments; this study examines the role of oxygen in these processes. Two anions, chloride and sulfate, were selected as aggressive adsorption species and two, nitrite and chromate, as passivating species. All four anions, in the presence of dissolved oxygen, were evaluated singly over a concentration range of five orders of magnitude in order to obtain the effect of concentration in each case. These four anions were then studied in groupings of two and three to ascertain the relative proportions of inhibiting and noninhibiting ions necessary to ensure passivity. Instantaneous corrosion rates measured by the linear polarization method were used as the criteria in comparing the effect of environmental changes. Multiple regression analysis techniques were utilized to obtain quantitative relationships between the concentrations of the four anions studied and the corrosion rates observed. The results are compared to those obtained in oxygen-free systems and are applied to a consideration of the mechanism of formation and maintenance of a passive film. This is discussed in terms of electrochemical polarization, competitive adsorption and passive film stability.

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