{"id":3225,"date":"2026-06-24T16:13:04","date_gmt":"2026-06-24T14:13:04","guid":{"rendered":"https:\/\/www.technical-center.de\/wiki\/aggressive-media\/"},"modified":"2026-06-24T16:13:04","modified_gmt":"2026-06-24T14:13:04","slug":"aggressive-media","status":"publish","type":"encyclopedia","link":"https:\/\/www.technical-center.de\/en\/glossary\/aggressive-media\/","title":{"rendered":"Aggressive Media"},"content":{"rendered":"\n<p><strong>Definition:<\/strong> Aggressive media are chemical or physico-chemical substances that can damage materials through <a class=\"tc-inlink\" href=\"\/en\/corrosion-consulting-and-testing\/\">corrosion<\/a>, stress corrosion cracking, hydrogen uptake or erosion. These include acids, alkalis, chloride-containing solutions, high-temperature water and hydrogen-bearing process atmospheres. The assessment takes into account temperature, pressure, concentration and flow conditions.<\/p>\n<p><strong>Practical relevance:<\/strong> In chemical plants, power stations, offshore or pressure-equipment systems, aggressive media decisively determine the material selection and the corrosion-protection concept. Key parameters are the corrosion rate (mm\/year), pitting potential, pH value, redox potential and material properties in accordance with DIN EN ISO 8044. Incorrect assessments can lead to leaks, <a class=\"tc-inlink\" href=\"\/en\/research-special-testing\/hydrogen-resistance-htha-plant-engineering\/\">HTHA<\/a> damage or premature component failure.<\/p>\n<p><strong>Decision-making perspectives:<\/strong><\/p>\n<ul>\n<li><strong>Technical decision-makers:<\/strong> selection of suitable alloys, <a class=\"tc-inlink\" href=\"\/en\/materials-engineering\/coating-technology-processes-and-applications\/\">coatings<\/a> or cathodic protection systems under defined operating parameters.<\/li>\n<li><strong>Purchasing\/project management:<\/strong> definition of resistance verifications, specifications and test requirements in the requirement specification.<\/li>\n<li><strong>Science:<\/strong> analysis of electrochemical mechanisms, polarisation curves, long-term exposure tests.<\/li>\n<li><strong>Insurance\/law:<\/strong> proof of standard-compliant material selection, documentation of the risk and hazard assessment.<\/li>\n<\/ul>\n<p><strong>Typical testing or verification methods:<\/strong> <a class=\"tc-inlink\" href=\"\/en\/corrosion-consulting-and-testing\/corrosion-testing-methods-and-procedures\/\">corrosion testing<\/a>, salt spray test (DIN EN ISO 9227), electrochemical polarisation measurements, materials analysis.<\/p>\n<p><strong>FAQ:<\/strong><\/p>\n<ul>\n<li>How is resistance to aggressive media assessed?<\/li>\n<li>Through standardised laboratory tests, field tests and the quantitative determination of the corrosion rate under defined boundary conditions.<\/li>\n<\/ul>\n<\/div>\n","protected":false},"author":0,"featured_media":0,"template":"","encyclopedia-tag":[],"class_list":["post-3225","encyclopedia","type-encyclopedia","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.technical-center.de\/en\/wp-json\/wp\/v2\/encyclopedia\/3225","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.technical-center.de\/en\/wp-json\/wp\/v2\/encyclopedia"}],"about":[{"href":"https:\/\/www.technical-center.de\/en\/wp-json\/wp\/v2\/types\/encyclopedia"}],"wp:attachment":[{"href":"https:\/\/www.technical-center.de\/en\/wp-json\/wp\/v2\/media?parent=3225"}],"wp:term":[{"taxonomy":"encyclopedia-tag","embeddable":true,"href":"https:\/\/www.technical-center.de\/en\/wp-json\/wp\/v2\/encyclopedia-tag?post=3225"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}