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| Frequently Asked Questions
Can I use the Corrosion Doctors site in support of my teaching?Such a usage of the site is highly encouraged at all levels of education, from primary school to PhD degrees. How do I measure the corrosivity of an atmospheric environment?Assessing the corrosivity of a particular atmosphere is rather simple and two general methods have been developed over the past years. The first method involves the exposure of metallic coupons to the environment to rank the resultant corrosion damage. The second method involves measuring several atmospheric parameters and classifying the atmosphere according to standardized measurements. There have been international standards developed for testing by both methods. One of the coupon based test methods is the CLIMAT test based on the wire on bolt ASTM standard. There is an ISO specification (ISO 9223) for determining a material specific corrosivity of atmospheres based on various atmospheric measurements (relative humidity, sulfur dioxide concentration, and chloride deposition). Back to TopHow can I learn to Navigate on the Corrosion Doctors Web site?The simplest way is to try different things on your own. You can also consult the following page by clicking on the icon:
Back to TopWhat is a corrosion attack?The main symptom of a corrosion attack is a general feeling of wear and tear often associated with long hours, a bad boss and other niceties of a human life on this planet. Some have attributed this uninteresting state of mind to an increased level of solar activity while others believe it can be explained with the help of biorhythms. The Corrosion Doctors personally tend towards the second explanation. You can find more about these causes of trouble by visiting: Back to TopWhat are Pourbaix Diagrams?Potential-pH (E-pH) diagrams, also called predominance or Pourbaix diagrams, have been adopted universally since their introduction in the 1950s. They have been repetitively proven an elegant way to represent the thermodynamic stability of chemical species in given aqueous environments. E-pH diagrams are typically plotted for various equilibria on normal cartesian coordinates with potential (E) as the ordinate (Y axis) and pH as the abscissa (X axis).Pourbaix diagrams are a convenient way of summarizing much thermodynamic data and provide a useful means of predicting electrochemical and chemical processes that could potentially occur in certain conditions of pressure, temperature and chemical make-up. These diagrams have been particularly fruitful in contributing to the understanding of corrosion reactions. Back to TopWhat is Electrochemical Noise?Electrochemical noise measurements have been used to study corrosion processes since the early 1980's. Preliminary studies of the electrochemical characteristics of localized corrosion phenomena, in particular pitting and cavitation attack, established the sensitivity of the technique for the detection of spontaneous changes in corrosion processes. It is well established that certain types of corrosion processes, in particular localized corrosion phenomena had characteristic signatures. While the measurement of electrochemical noise is straightforward, the data analysis can be complex. Such analysis is usually directed at distinguishing between different forms of corrosion, quantifying the noise signals and processing large numbers of accumulated data points into a summarized format. The Corrosion Doctors use special tools to reduce the complexity of noise signals while revealing important features related to localized attack. Back to TopSend your comments and questions to our Anywhere and anytime you can also search the Corrosion Doctors Web site with Google that has cataloged most pages and words the site contains. |
