{"id":8217,"date":"2021-07-16T16:15:18","date_gmt":"2021-07-16T14:15:18","guid":{"rendered":"https:\/\/www.tempco.it\/blog\/?p=8217"},"modified":"2021-07-16T16:16:11","modified_gmt":"2021-07-16T14:16:11","slug":"heat-exchangers-and-corrosion-of-materials-in-anodic-oxidation","status":"publish","type":"post","link":"https:\/\/www.tempco.it\/blog\/en\/8217\/heat-exchangers-and-corrosion-of-materials-in-anodic-oxidation\/","title":{"rendered":"Heat exchangers and corrosion of materials in anodic oxidation"},"content":{"rendered":"<p>Previous videos focused on <strong><a href=\"https:\/\/www.tempco.it\/blog\/en\/8040\/how-to-determine-the-thermal-duty-in-anodic-oxidation-cooling\/\">anodic oxidation applications<\/a><\/strong> triggered some questions, mostly referred to the <a href=\"https:\/\/www.tempco.it\/blog\/en\/5122\/metal-corrosion-in-thermal-machines-2\/\" target=\"_blank\" rel=\"noopener\"><strong>selection of corrosion resistant materials<\/strong><\/a> in <a href=\"https:\/\/en.tempco.it\/solutions-en\/heat-exchangers\/\" target=\"_blank\" rel=\"noopener\"><strong>heat exchangers<\/strong><\/a>. In fact, heat exchangers employed in anodic oxidation have to work with <strong>solutions of sulphuric acid<\/strong> with 20% concentration, at temperatures of approx 20-25\u00b0 C. Based on ISO-corrosion diagrams, these conditions would suggest the use of <strong>AISI 316<\/strong>. But the risk in these kind of plants is that the temperature goes even higher, for example during the shut down of the plants during the summer season.<\/p>\n<p>Another kind of material must then be selected, being the <strong>Avesta 254 SMO<\/strong>, a high-performing alloy which offers <strong>excellent corrosion resistance<\/strong> even at high concentrations of suplhuric acid and temperature levels. In case it\u2019s not enough, it is also possible to use <strong>Titanium<\/strong>, commonly employed with <a href=\"https:\/\/www.tempco.it\/blog\/en\/7359\/immersion-cooling-at-the-marina-di-loano-seaport\/\" target=\"_blank\" rel=\"noopener\">seawater applications<\/a> thanks to its excellent resistance to high concentrations of chlorides and high temperatures.<\/p>\n<p>Talking about costs, if AISI 316 represents 100, for both Avesta 254 SMO and Titanium the cost is about 200, depending on variations on the market.<\/p>\n<p>When sulphuric acid concentration gets higher the problem gets more complicated, and Avesta and titanium are no more suitable. It is therefore necessary to use <strong>Hastelloy C276<\/strong>, another high-performing alloy with a quite high cost and with relatively low availability on the market. Anyway, this is a kind of material that <strong>can be cold-printed<\/strong>, and so a perfect solution for plates in heat exchangers.<\/p>\n<p><iframe loading=\"lazy\" width=\"750\" height=\"422\" src=\"https:\/\/www.youtube.com\/embed\/6S09lnIuDcM?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n<p>&nbsp;<\/p>\n<p>The options are quite similar in case of <a href=\"https:\/\/en.tempco.it\/solutions-en\/heat-exchangers\/shell-and-tube-heat-exchangers\/\" target=\"_blank\" rel=\"noopener\"><strong>shell and tube exchangers<\/strong><\/a>, being it possible to find on the market tubes in Avesta 254 SMO, and also titanium pipes even if it can be a little more difficult, as well as for Hastelloy C276. But there are also other materials that can be employed here, such as <strong>Incoloy<\/strong> and <strong>Monel<\/strong>. These are anyway more sophisticated materials, involving higher costs both for the raw material and the working process.<\/p>\n<p>When the corrosion level goes even higher, it\u2019s also possible to use <strong>graphite exchangers<\/strong>. These are exchangers with a peculiar construction, in some way similar to plate and shell and tube exchangers, made using mixtures of graphite.<\/p>\n<p>Moreover there are <strong>plastic exchangers<\/strong>, in particular <a href=\"https:\/\/www.tempco.it\/blog\/en\/6839\/atex-thermoregulation-in-chemical-production\/\" target=\"_blank\" rel=\"noopener\"><strong>U tube bundle exchangers<\/strong><\/a> consisting in an ensemble of tiny plastic tubes to be immersed inside the tank to be thermoregulated. Usually these are made using <strong>polypropylene or PVC<\/strong> or other plastic materials, depending on the kind of application, workability and the temperature levels. Involving heating tasks, in fact, using plastic always requires great attention.<\/p>\n<p>Finally, leaving the anodic oxidation field and entering the <strong><a href=\"https:\/\/www.tempco.it\/blog\/en\/8156\/monofluid-thermoregulation-in-pharma-group-for-api-production\/\" target=\"_blank\" rel=\"noopener\">pharma sector<\/a><\/strong>, talking about resistance of materials using corrosive fluids there are also <strong>exchangers and reactors made with glass<\/strong>. Anyway, this is a completely different industrial production environment, with very different levels of accuracy and much more delicate than more &#8216;heavy&#8217; anodic oxidation plants.<\/p>\n<p>Subscribe here to our <strong><a href=\"https:\/\/en.tempco.it\/newsletter-solid-temperature\/\" target=\"_blank\" rel=\"noopener\">Tempco Newsletter &#8211; Solid Temperature<\/a><\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Selection of corrosion resistant materials in heat exchangers exposed to sulphuric acid solutions in anodic oxidation, from high-performing alloys to titanium, but also plastic and graphite exchangers.<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[247,469,63,113,473],"tags":[419,2943,1637,254,2448,2944,2940,2934,2935,2942,2936,148,2941,123,1627,1543,653,255,2945],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.5 - 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