concept Isocorrosion chart Use Estimate corrosion rates for an alloy Select an alloy for a particular application with specific parameters Definition A plot of temperature versus electrolyte concentration, with lines depicting combination where similar corrosion rates are found example how to use it? An application needs a temperature and concentration as depicted by point 1 in the image above. We can plot it on the isocorrosion chart for that alloy and estimate the corrosion rate. The design of the component and corrosion allowance can be decided accordingly. A method to determine the suitability of the alloy for an application and electrolyte-temperature combination. Video below for practical demo of the use of the chart! Dive Deeper: Tips to begin experiments Do you like to solve quizzes ? https://corrospective.com 😀 Happy learning! 😀

I recently moved to a new house. As expected, there was a lot of cleaning up to do. One of the tasks was the cleaning of the washbasin. Usually, the drain is a circular part with  5 to 6 holes for the water to flow out. What I saw was this - I have not had a chance to analyse the material of the drain. However, a quick search tells me that this is most probably stainless steel. The water that this drain is exposed to is the bore water. Thus, the drain has encountered a lot of chlorides. There is general as well as localized corrosion. The damage started off as a simple process of pitting. Pitting due to chlorides is one of the most common headaches for poor stainless steel. They break the passive oxide film, and reach the underlying fresh iron. This iron then reacts with the usual suspects (ions, oxygen, water) and forms what we see as the rust. As can be seen in the picture, the thin sections of the drain between the holes have disappeared in three places. This may have h...