Engineering Materals Essay Example | Topics and Well Written Essays - 1000 words

Engineering Materals - Essay Example Crevice corrosion is a localized and geometrically controlled form of corrosion. They are the products of situations containing a stagnant solution and corrosion friendly microenvironments. This type of corrosion can occur between rivet heads, lap joints, in threads and anywhere a small crevice is formed in which at least one side is a metal. As in all types of corrosion, an anodic reaction: exists which propagates over the entire surface. However, the geometry of the crevice restricts cathodic reaction such that the dissolved oxygen cannot be replaced. Thus the region within the crevice becomes exclusively anodic while the region outside becomes cathodic. An electric imbalance result attracting the negative ions into the crevice. The small size of the crevice screens the incoming ions such that the concentration of the chloride and the hydrogen ions increases within the crevice. The pH of the solution within the crevice decreases from 6 to as much as 2 or 3. This increased acidity causes further corrosion within the crevice resulting in massive material erosion from within the crevice region. In most cases, crevice corrosion is not visible from the outside and this hidden nature makes inspection as well as rectification difficult. This is schematically represented in the figure shown: Pitting corrosion is a form of localized corrosion as it does not spread laterally across an exposed surface rapidly but penetrates into the metal very quickly, usually at an angle of 90o to the surface. Stagnant solution conditions favor pitting corrosion. The presence of halide ions, chloride, fluoride bromide and iodide, can all pit metals. The most aggressive ion depends on the metal and ion combination. The effect of pitting is to cause holes on the metal surface which can corrode a large amount of material from the surface. The mechanism of pitting can be divided into two processes – the initiation

How telecommunication has shaped the work place Assignment

How telecommunication has shaped the work place - Assignment Example Other pertinent information contained in the white paper could be cited as an authoritative source backed by statistical information and encompasses different organizations on a global sphere. The annual report published by Deloitte presented crucial information regarding three significant drivers of change in the global setting: technology, media and telecommunications. From among the noted predictions under telecommunications include: (1) the preponderance of $100 smartphones; (2) technological devise with near field communications (NFC) capabilities would double in growth; (3) web bypass would predominate emphasizing visual connectivity without the need for Internet access; among others. The information contained herein is relevant in the current research in terms of clearly identifying future trends which have significant impacts in the work setting through its impact on current telecommunications resources used by contemporary global organizations; as well as the need to adapt, adjust, and upgrade, as identified. The authors aimed to determine the impact of smartphones in the health care work settings by initially providing an overview of the development of smartphones. Likewise, the authors expounded on assessing how smartphones were instrumental in transforming the work setting in health institutions through the various applications that were initially offered and which caters to the health care environment. The apparent distraction from tasks were closely examined through a SWOT analysis. The findings revealed some detailed guidelines and best practices to monitor and control the use of smartphones and ensure their beneficial applications within the health care setting. This article is useful in the current study particularly in identifying how a telecommunications application, through the smartphone, has significantly affected and shaped the