Corrosion case studies

Another way to study corrosion in pipe lines is to install in the line short sections of pipe of the materials to be tested. These test sections should be insulated from each other and from the rest of the piping system by means of nonmetalhc couphngs. It is also good prac-tice to provide insulating gaskets between the ends of the pipe specimens where they meet inside the couplings. Such joints may be sealed with various types of dope or cement. It is desirable in such cases to paint the outside of the specimens so as to confine corrosion to the inner surface. 

In the next chapter we shall look at some case studies in corrosion-resistant designs which are based on the ideas we have just discussed. 

We now examine three real corrosion problems the protection of pipelines, the selection of a material for a factory roof, and materials for car exhaust systems. The rusting of iron appears in all three case studies, but the best way of overcoming it differs in each. Sometimes the best thing is to change to a new material which does not rust but often economics prevent this, and ways must be found to slow down or stop the rusting reaction. 

XPS is very useful for the study of surface layers and corrosion films. In the case of corrosion films and oxides it is important to do depth profiling by coupling XPS with ion milling of the surface. Another important aspect of XPS is that the incident X-rays cause negligible damage to the surface. 

Meyer, W.J. and G.H. Hall (1979), Prediction of sulfide generation and corrosion in concrete gravity sewers A case study, J. B. Gilbert Associates, A Division of Brown and Caldwell, Sacramento, CA. 

The Corrosion Doctors site at http //www.corrosion-doctors.org contains lots of interesting case studies. 

At first glance, this incident does not appear to be process safety related since there was no direct loss of containment however, many factors make it important to review. The material involved in the incident was an undesirable byproduct of an engineered process. AAdien unknown material accumulates in an undesirable location, it often creates a physical hazard. This hazard may directly trigger a loss when it is least expected. Accumulated solids in closed systems may contribute to corrosion, blockage, and physical damage. This accident case study should also be examined in the context of an enclosed system. 

Domenech A, Domenech-Carbo MT, Martfnez-Lazaro I (2008) Electrochemical identification of bronze corrosion products in archaeological artefacts. A case study. Microchim Acta 162 351-359. 

It is easily understood by intuition that acids, bases, oxidants, chelators, etc. express their reactivity with more or less intensity. Some are called a strong acid, a weak oxidant. In Sect. 3.4.3.1, we will study the importance of the applications of this theoretical approach for the understanding and the prediction of the importance of ocular lesions in case of corrosive projections. 

Case Studies of Corrosive and Heavy Metal Waste Minimization Audit at a Specialty Steel Manufacturing Complex, (NTIS PB83-107180/GAR). 

Case Studies Illustrating the Importance of Corrosion / Selection of Materials Associated Octel Company Limited (1/2/1994) www.hse. gov.uk... 

Consider the application of a small sinusoidal potential ( AE sin cut) on a corroding sample, which results in a signal along with the current flow of harmonics 2cq, 3co, etc. Then the impedance A/ sin ( of + r/j) is the relation between AE/ Al and phase (j). In the case of corrosion studies, the sample is made part of a system known as equivalent circuit,24 which consists of the solution resistance Rs, charge transfer resistance Rqt and the capacitance of the double layer Cdi- The measured impedance plot appears in the form of... 

Effect on Confined Systems Corrosion Problems Fracture Fatigue Nano Characterisation Test Methodology Computer Simulation Surface Modification Surface Treatments Surface Problems in Contact Mechanics Fracture Mechanics Coupled Analysis and Experiments Thin Coatings Thick Coatings Contact Mechanics Material Surfaces in Contact Applications and Case Studies Indentation and Hardness Adhesion Bonding. 

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