scholarly journals Wear and Corrosion of Wrought A6061 Aluminium Alloy in DOT3 Brake Fluid

2018 ◽  
Vol 7 (2.14) ◽  
pp. 512 ◽  
Author(s):  
Olawale Ajibola ◽  
Oladeji Ige ◽  
Peter Olubambi
Keyword(s):  
Corrosion Rate ◽  
Test Method ◽  
Alloy Sample ◽  
Corrosive Media ◽  
Chemical Corrosion ◽  
Brake Fluid ◽  
Wear And Corrosion ◽  
Cast Specimen ◽  
Fluid Environment ◽  
A6061 Alloy

The twofold impact of wear and corrosion on wrought A6061 alloy in hydraulic DOT3 brake fluid environment was studied. The wear studies were performed on the samples using a developed wear-jig. Weight loss corrosion test method was used to determine the corrosion rate of the wrought A6061 alloy samples immersed in the brake fluid for a total of 1680 hours. From the results of wear tests carried out on the A6061 alloy sample with brake oil, the highest wear value of 5.24x10-7 mg/mm2/cycle (approx.) was obtained from 6 N (approx) force after 130 minutes. The wrought A6061 alloy material demonstrated the highest corrosion rates nearly 3.0 x10-2 mg/mm2/yr within the early 168 hours of immersion in brake fluid. The result is practically lower than the corrosion rate of cast specimen in DOT3 brake oil or some other alloys immersed in other corrosive media that were previously reported in the literature. The results show that small amount of chemical corrosion is sufficient to cause and accelerate mechanical wear of the material in usage.

scholarly journals Wear and Corrosion of Cast Al Alloy Piston with and without Brake Oil

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Olawale Olarewaju Ajibola ◽  
Daniel Toyin Oloruntoba
Keyword(s):  
Wear Rate ◽  
Corrosion Rate ◽  
Aqueous Solutions ◽  
Al Alloy ◽  
Material Loss ◽  
Abrasion Test ◽  
Brake Fluid ◽  
Wear And Corrosion ◽  
Aa6061 Aluminium Alloy ◽  
Combined Actions

The effects of wear and corrosion of cast AA6061 aluminium alloy were studied with and without brake fluid using a wear jig while the corrosion rate was determined in brake fluid for 70 days under two experimental set-ups. The tests, yielded 0.00000123 g/mm2/min highest wear rate at 147000 wear cycles and 0.0334 mg/mm2/yr as the highest corrosion rate within the early 39th day of immersion in oil, the values being considered comparatively lower than those obtained for Al alloy in most common wet abrasion test and corrosion in aqueous solutions as previously reported in literature. The material loss rates to wear and corrosion were determined from the equations relating to wear and corrosion based on the ASTM designations. The results show that the combined actions of wear and corrosion contribute to the total loss of piston material immersed in brake oil. This is greater than either of their effects individually on cast Al alloy in the brake oil.

Analytical solution for the lifetime of a spherical shell of arbitrary thickness under the pressure of corrosive environments: The effect of thermal and elastic stresses

2021 ◽  
pp. 1-25
Author(s):  
Yulia G. Pronina ◽  
Olga S. Sedova
Keyword(s):  
Corrosion Rate ◽  
Spherical Shell ◽  
Stress Component ◽  
Equivalent Stress ◽  
Circumferential Stress ◽  
Thermoelastic Stress ◽  
Decisive Role ◽  
Process Conditions ◽  
Corrosive Media ◽  
Arbitrary Thickness

Abstract The paper presents analytical solutions to initial boundary value problems of thermoelasticity with a priori unknown evolving boundaries. To be more precise, we consider a spherical shell of arbitrary thickness subjected to the internal and external pressures of corrosive media at generally different temperatures, with taking into account the mechanochemical effect and inhibition of corrosion process. Conditions under which the circumferential stress can serve as the equivalent stress are determined. It was found that the life of the shell was influenced by the competing effects of the pressures and temperatures on the corrosion rate and stress values, as well as by possible moving the location of the maximal stress. It was also concluded that the elastic stress component played a decisive role in the synergistic growth of the total thermoelastic stress and the corrosion rate.

scholarly journals Technical Evaluation Method for Physical Property Changes due to Environmental Degradation of Grout-Injection Repair Materials for Water-Leakage Cracks

2019 ◽  
Vol 9 (9) ◽  
pp. 1740 ◽  
Author(s):  
Jiang ◽  
Oh ◽  
Kim ◽  
He ◽  
Oh
Keyword(s):  
Environmental Degradation ◽  
Evaluation Method ◽  
Physical Property ◽  
Performance Comparison ◽  
Test Method ◽  
Grout Injection ◽  
Chemical Corrosion ◽  
Technical Evaluation ◽  
Injection Materials ◽  
Property Changes

Leakage in below-grade concrete structures are repaired using various types of grout-injection materials, but the selection of optimal material types with a consideration of the environmental degradation factors are not conducted. Different degradation factors can act on the waterproofing membranes or grout-injection materials simultaneously. Especially in the early stages of installation, the injected grout materials in the cracks for leakage repair or for reforming damaged waterproofing layers are subject to complex forms of degradation factors. In such cases, physical property changes to the materials can reduce the waterproofing performance of the grout-injection materials. In this study, a technical evaluation regime is proposed for selecting the optimal repair material to be used in underground concrete structure leakage cracks. In this study, six environmental degradation factors (thermal stress, chemical corrosion, erosion due to ground water flow, hydrostatic pressure, substrate movement, and humidity on concrete surface) are identified. Corresponding evaluation methods based on the ISO TS 16774 test method series were used for each factor to assess the performance evaluation of four different types of grout-injection materials (acrylic resin, epoxy resin, polyurethane foam, and synthetic polymerized rubber gel). Based on the test results, a new comprehensive evaluation regime is presented that allows a quantitative performance comparison between each type of grout-injection material.

Effect of Vanadium Addition to Aluminum and Aluminum Grain Refined by Titanium on their Chemical Corrosion Rate in Acidic Solution, HCL, at Different Temperatures

2012 ◽  
Vol 510-511 ◽  
pp. 481-486
Author(s):  
A.I.O. Zaid ◽  
G.T.A. Allawi ◽  
A. Al-Haj-Ali
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Acidic Solution ◽  
Chemical Corrosion ◽  
Different Temperatures

The paper presents the effect of vanadium addition to aluminum and aluminum grain refined by titanium on the micron level, in the range from 0.005 wt % to 0.236 wt %, on their corrosion resistance in acidic solution, HCl, at three different temperatures namely: 25 °C, 40 °C and 60 °C. It was found that the corrosion rate was slightly increased by the addition of any percentage of vanadium at 25 °C. Furthermore, it was found that the corrosion rate increased with the increase of temperature at any percentage of vanadium addition in the case of both aluminum and aluminum grain refined by titanium. However it was found that addition of vanadium at any percentage to either aluminum or aluminum+ titanium, resulted in decrease of the corrosion rate i.e. improvement in their corrosion resistance in acidic solution at 40 °C and 60 °C. The maximum achieved reduction in corrosion rate was 77 % at 40 °C and 0.148 wt % vanadium addition.

scholarly journals Influence of Heat Treatment on the Corrosion Behaviour of Aluminium Silver Nano Particle/Calcium Carbonate Composite

2021 ◽  
Vol 5 (10) ◽  
pp. 280
Author(s):  
Omolayo Michael Ikumapayi ◽  
Esther T. Akinlabi ◽  
Olayinka Oluwatosin Abegunde ◽  
Precious Ken-Ezihuo ◽  
Henry A. Benjamin ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Corrosion Rate ◽  
Corrosion Behaviour ◽  
Stir Casting ◽  
Corrosion Properties ◽  
Corrosive Media ◽  
Loss Analysis ◽  
Weight Composition ◽  
Analysis Technique ◽  
Hybrid Reinforcement

Corrosion is one of the leading sources of material failure and deterioration in society. Scholars have proposed different techniques to mitigate corrosion. This research study explores and validates one of these techniques. An Aluminium metal matrix (AMC) was produced using the stir casting method with various weight percentages of AgNp and CaCO3 reinforcements. Heat treatment was performed on the samples to enhance the metallurgical and corrosion properties of the materials. The corrosion rate of the AMC samples was tested in different corrosive media (neutral and acidic) with different concentrations using the weight loss analysis technique for several days. It was observed that the corrosion rate of the AMC relies on the nature of the electrolyte and the percentage concentration of this electrolyte. The heat treatment improves the corrosion resistance of the AMC samples. In addition, an increase in the % weight composition of the reinforcement (AgNp + CaCO3) results in a reduction in the corrosion rate of the AMC in both corrosive media. The optimal %weight composition was found to be 4% for the hybrid reinforcement of AgNp + CaCO3 and 6% for the CaCO3 reinforcement in both the untreated and heat-treated samples.

Experimental Investigation on the Roles of Chemical Corrosion and Mechanical Polishing on Copper CMP

2004 ◽  
Author(s):  
Jhy-Cherng Tsai ◽  
Yaw-Yi Shieh ◽  
Ming-Shih Tsai ◽  
Bau-Tong Dai
Keyword(s):  
Experimental Investigation ◽  
Corrosion Rate ◽  
Removal Rate ◽  
Copper Film ◽  
Mechanical Polishing ◽  
Copper Films ◽  
Linear Superposition ◽  
Chemical Corrosion ◽  
The Relationship ◽  
Better Than

This paper is an experimental investigation on the roles of chemical corrosion and mechanical polishing of the chemical mechanical polishing (CMP) of wafers with copper film of 1,000 nm thickness. Three types of experiments are designed and conducted: chemical corrosion, mechanical polishing, and CMP with φ0.3μm Al2O3 as abrasives. The results showed that copper films after PVD and annealing sustain tensile stress that intensifies corrosion rate. In general, the stress of copper film increases at higher annealing temperature and the corrosion rate increases correspondingly though the relationship is weak. The polishing rate of pure mechanical polishing is about the same as that of pure chemical corrosion, but surface roughness of mechanical polishing and CMP are much better than that of chemical corrosion. Furthermore, the removal rate of mechanical polishing and chemical corrosion, about 2nm/min, are relatively low compared to that of CMP, about 30nm/min, it indicates that the removal mechanism of CMP is not simply a linear superposition of chemical corrosion and mechanical polishing. The strong interaction and the combined reaction of chemical corrosion and mechanical polishing need further investigation.

Erosion Corrosion of Drill Pipe During Drilling Operations

2021 ◽  
Author(s):  
Mortatha Saadoon AL-Yasiri
Keyword(s):  
Corrosion Rate ◽  
High Speed ◽  
Drill Pipe ◽  
Solid Particles ◽  
Drilling Fluids ◽  
Unit Surface Area ◽  
Drill Cuttings ◽  
Wear And Corrosion ◽  
Erosion Corrosion ◽  
The Impact

Abstract The presence of high rotating speeds and weights, the corrosiveness of water-based drilling muds, and high-speed mud with embedded cuttings, exposing drill string components to severe wear and corrosion that reduce their service life. The drill pipe erosion, abrasive wear and corrosion depend on properties of drilled cuttings and drilling fluids. Any variation in these properties leads to change in pipe degradation rate. There is a need to study the effect of individual factors, for expecting the drill pipe series life and to find a solution to this challenging problem. This research aims to evaluate the influence of real rock cuttings sizes and concentration as well as we investigate the effect of base fluid type on the erosion-corrosion rate. Actual drilled cuttings have been sieved to get three sizes of erodent cuttings; namely, 0.841 to 3.3 mm. Experiments are done with three sand concentrations (5%, 10% and 15%). The rate of erosion-corrosion of the drill pipe specimens is measured as the loss of weight per unit surface area per unit time under the dynamic action of solid particles. The eroded surfaces of the specimens are examined using Scanning Electron Microscopy (SEM) to visualise the impact of the drill cuttings at various conditions. It is seen that the rate of corrosion/erosion decreases with the increase of drilled cuttings concentration. Also, high erosion-corrosion rate is detected in situation of large drill cuttings particles. In this research, we explored a novel simple technique to simulate pipe erosion-corrosion in a reservoir-like environment. Furthermore, this paper proposed a new approach to control drill pipe erosion-corrosion by using SiO2-nanofluid.

Chemical Corrosion of Lead-Iron Phosphate Glass

1987 ◽  
Vol 112 ◽  
Author(s):  
Werner Lutze ◽  
P. Schubert
Keyword(s):  
Corrosion Rate ◽  
Dissolution Kinetics ◽  
Iron Phosphate ◽  
Corrosion Mechanism ◽  
Chemical Corrosion ◽  
Total Mass Loss ◽  
Glass Corrosion ◽  
Activity Measurements ◽  
Doped Glasses ◽  
In The Beginning

AbstractThis study provides experimental data on the corrosion of lead-iron phosphate (LIP) glass (6.4 wt% LWR waste loading) and the first comparison with the dissolution kinetics of borosilicate (BS) nuclear waste glass (all experiments at 90°C). Based on previous experiments the hypothesis was made that the alteration phenomena and the corrosion mechanism are analogous to what is known for BS glasses. The corrosion rate was found to be constant, 0.06gm−2d−1, at high flow rates (MCC 5 type test), based on total mass loss and on ion conductivity measurements in the leachate. In an MCC 1 type experiment, doped glasses (32p, 210Pb and 137Cs, respectively) were corroded and the release of activity into solution monitored. The release rates were 0.05gm−2 d−1 in the beginning, but decreased drastically when the solution became saturated with respect to Pb(OH)2 and Pb3 (PO4)2. Glass corrosion continued at a low rate as indicated by Cs activity measurements. The higher chemical durability of the LIP glass vs. BS glasses in DI water is a result of a smaller initial corrosion rate (10 to 10O×) and the fact that the saturation concentration is lower for LIP glass, i. e. it takes less dissolved glass (10 to 50×) to reach saturation than in the case of BS glass.

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