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The corrosivity of four mercaptans and selected crude oil fractions were measured in lab tests. Conclusion: Mercaptan corrosion can contribute significantly to the total sulfur related corrosion in the temperature range 235–300°C, which agrees with observations of elevated temperature corrosion in refinery distillation equipment.
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Measuring the severity of corrosion on a specific alloy is often accomplished via mass loss using ASTM G-1. These processes work well and provide high fidelity data for many materials, especially steels. However, recent internal findings and disclosures from other research groups have highlighted a potential issue with using mass loss techniques to measure the damage on some aluminum alloy surfaces.
Ferric chloride corrosion testing has been used to detect the presence of deleterious intermetallic phases and non-metallic precipitates in duplex stainless steels, such as sigma, Chi and chromium nitrides, for several decades. These corrosion tests are normally specified alongside metallographic assessment and impact testing as combined measures to demonstrate that these materials have been processed and heat treated in a satisfactory manner and exhibit suitable microstructures which should give the required mechanical and corrosion (and cracking) resistance.
Japanese tap water has a low calcium hardness compared with those of countries in Europe and the Americas. There are many steep mountains and volcanos in Japan. These geological factors lead to features such as short rivers with water rich in SiO2. This leads to a lack of calcium compounds in river water because the flow rate is high and the dissolution rate of CaCO3 into water is low.
Thus to establish the precision of ISO 20340 Annex A six laboratories participated in a round-robin evaluation of ISO 20340 annex A test method for the first time. The aim was to estimate the repeatability and the reproducibility of this test.