{"id":2734,"date":"2022-06-20T07:52:50","date_gmt":"2022-06-20T07:52:50","guid":{"rendered":"https:\/\/nanotechvietnam.com\/02-tac-nhan-gay-an-mon-cho-kim-loai-be-mat-vat-lieu\/"},"modified":"2022-07-06T02:29:16","modified_gmt":"2022-07-06T02:29:16","slug":"02-tac-nhan-gay-an-mon-cho-kim-loai-be-mat-vat-lieu","status":"publish","type":"post","link":"https:\/\/nanotechvietnam.com\/en\/02-tac-nhan-gay-an-mon-cho-kim-loai-be-mat-vat-lieu\/","title":{"rendered":"02 CORROSION AGENTS FOR METAL, SURFACE OF MATERIAL"},"content":{"rendered":"<p><span style=\"color: #3366ff;\">According to statistics, the average amount of metal corroded annually in the world is about 10-30% of the volume of metal produced. Corrosion of materials causes great damage and loss in terms of economy as well as human life. In order to prevent metal corrosion, we need to understand the agents that cause corrosion to metal, the surface of the material.<\/span><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_50 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">M\u1ee5c l\u1ee5c<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\" role=\"button\"><label for=\"item-69d46eb9dc535\" aria-hidden=\"true\"><span style=\"display: flex;align-items: center;width: 35px;height: 30px;justify-content: center;direction:ltr;\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/label><input  type=\"checkbox\" id=\"item-69d46eb9dc535\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/nanotechvietnam.com\/en\/02-tac-nhan-gay-an-mon-cho-kim-loai-be-mat-vat-lieu\/#There_are_02_common_types_of_metal_corrosion_agents_today_we_need_to_pay_attention\" title=\"There are 02 common types of metal corrosion agents today, we need to pay attention:\">There are 02 common types of metal corrosion agents today, we need to pay attention:<\/a><ul class='ez-toc-list-level-2'><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/nanotechvietnam.com\/en\/02-tac-nhan-gay-an-mon-cho-kim-loai-be-mat-vat-lieu\/#Chemical_corrosion\" title=\"Chemical corrosion: \">Chemical corrosion: <\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/nanotechvietnam.com\/en\/02-tac-nhan-gay-an-mon-cho-kim-loai-be-mat-vat-lieu\/#Electrochemical_corrosion\" title=\"Electrochemical corrosion\">Electrochemical corrosion<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/nanotechvietnam.com\/en\/02-tac-nhan-gay-an-mon-cho-kim-loai-be-mat-vat-lieu\/#Mechanism_of_electrochemical_corrosion\" title=\"Mechanism of electrochemical corrosion\">Mechanism of electrochemical corrosion<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/nanotechvietnam.com\/en\/02-tac-nhan-gay-an-mon-cho-kim-loai-be-mat-vat-lieu\/#Conditions_for_the_occurrence_of_electrochemical_corrosion\" title=\"Conditions for the occurrence of electrochemical corrosion\">Conditions for the occurrence of electrochemical corrosion<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/nanotechvietnam.com\/en\/02-tac-nhan-gay-an-mon-cho-kim-loai-be-mat-vat-lieu\/#Surface_protection_method\" title=\"Surface protection method\">Surface protection method<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/nanotechvietnam.com\/en\/02-tac-nhan-gay-an-mon-cho-kim-loai-be-mat-vat-lieu\/#References\" title=\"References:\">References:<\/a><\/li><\/ul><\/nav><\/div>\n<h1><span class=\"ez-toc-section\" id=\"There_are_02_common_types_of_metal_corrosion_agents_today_we_need_to_pay_attention\"><\/span><span style=\"color: #3366ff;\">There are 02 common types of metal corrosion agents today, we need to pay attention:<\/span><span class=\"ez-toc-section-end\"><\/span><\/h1>\n<h2><span class=\"ez-toc-section\" id=\"Chemical_corrosion\"><\/span><span style=\"color: #3366ff;\">Chemical corrosion: <\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"color: #3366ff;\">&#8211; is a redox process in which the electrons of a metal are transferred directly to substances in the environment.<\/span><\/p>\n<p><span style=\"color: #3366ff;\">&#8211; Chemical corrosion often occurs in metal parts of machinery or equipment that are frequently exposed to chemicals, oxygen, and steam at high temperatures. The higher the temperature, the faster the metal corrodes.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Electrochemical_corrosion\"><\/span><span style=\"color: #3366ff;\">Electrochemical corrosion<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"color: #3366ff;\">&#8211; is an oxidation-reduction process in which the metal is corroded by the action of the electrolyte solution and creates a flow of electrons from the cathode to the anode.<\/span><\/p>\n<p><span style=\"color: #3366ff;\">&#8211; Electrochemical corrosion usually occurs when the metal pair (or alloy) is left out in moist air, or immersed in an acid solution, salt solution, in pure mineral water, etc.<\/span><\/p>\n<p><img decoding=\"async\" class=\"lazyload aligncenter wp-image-2382 size-full\" src=\"https:\/\/nanotechvietnam.com\/wp-content\/uploads\/2022\/06\/an-mon-hoa-hoc-la-gi-3.jpg\" data-orig-src=\"https:\/\/nanotechvietnam.com\/wp-content\/uploads\/2022\/06\/an-mon-hoa-hoc-la-gi-3.jpg\" alt=\"Electrochemical corrosion\" width=\"500\" height=\"375\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20width%3D%27500%27%20height%3D%27375%27%20viewBox%3D%270%200%20500%20375%27%3E%3Crect%20width%3D%27500%27%20height%3D%27375%27%20fill-opacity%3D%220%22%2F%3E%3C%2Fsvg%3E\" data-srcset=\"https:\/\/nanotechvietnam.com\/wp-content\/uploads\/2022\/06\/an-mon-hoa-hoc-la-gi-3-200x150.jpg 200w, https:\/\/nanotechvietnam.com\/wp-content\/uploads\/2022\/06\/an-mon-hoa-hoc-la-gi-3-300x225.jpg 300w, https:\/\/nanotechvietnam.com\/wp-content\/uploads\/2022\/06\/an-mon-hoa-hoc-la-gi-3-400x300.jpg 400w, https:\/\/nanotechvietnam.com\/wp-content\/uploads\/2022\/06\/an-mon-hoa-hoc-la-gi-3.jpg 500w\" data-sizes=\"auto\" data-orig-sizes=\"(max-width: 500px) 100vw, 500px\" title=\"\"><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Mechanism_of_electrochemical_corrosion\"><\/span><span style=\"color: #3366ff;\">Mechanism of electrochemical corrosion<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"color: #3366ff;\">Cast iron or steel are Fe &#8211; C alloys, in which the cathode is Fe crystals, the anode is C crystals. These electrodes are in direct contact with each other and with an electrolyte solution. Thus, the object is corroded in an electrochemical fashion:<\/span><\/p>\n<p><span style=\"color: #3366ff;\">+ At the cathode: Fe atoms are oxidized to. These ions dissolve in an electrolyte solution in which some oxygen is already present, where they are further oxidized to.<\/span><\/p>\n<p><span style=\"color: #3366ff;\">+ At the anode: The hydrogen ions of the electrolyte solution move to the anode, where they are reduced to free hydrogen, then exit the electrolyte solution.<\/span><\/p>\n<p><span style=\"color: #3366ff;\">The Fe crystals are oxidized from the outside to the inside in turn. After a while, the cast iron (steel) object will corrode.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Conditions_for_the_occurrence_of_electrochemical_corrosion\"><\/span><span style=\"color: #3366ff;\">Conditions for the occurrence of electrochemical corrosion<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><span style=\"color: #3366ff;\">The electrodes must be different in nature, be it a pair of 2 different metals or a pair of metal with a nonmetal, etc.<\/span><\/li>\n<li><span style=\"color: #3366ff;\">The electrodes are in contact with an electrolyte solution<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #3366ff;\">Without any of the above three conditions, electrochemical corrosion will not occur<\/span><\/p>\n<p><span style=\"color: #3366ff;\">In nature, metal corrosion is complex, and both electrochemical and chemical corrosion can occur simultaneously.<\/span><\/p>\n<p><span style=\"color: #3366ff;\">Measures against metal corrosion<\/span><\/p>\n<h1><span class=\"ez-toc-section\" id=\"Surface_protection_method\"><\/span><span style=\"color: #3366ff;\">Surface protection method<\/span><span class=\"ez-toc-section-end\"><\/span><\/h1>\n<ul>\n<li><span style=\"color: #3366ff;\">Use sustainable substances to coat metal surfaces such as paints, greases, plastics, etc.<\/span><\/li>\n<li><span style=\"color: #3366ff;\">Clean, store in a dry place<\/span><\/li>\n<li><span style=\"color: #3366ff;\">Western iron is iron coated with tin, corrugated iron is iron coated with zinc. Iron objects are often plated with Nickel or Chromium<\/span><\/li>\n<li><span style=\"color: #3366ff;\">Use a metal as a \u201csacrifice\u201d to protect metal materials.<\/span><\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"lazyload aligncenter wp-image-1729 size-full\" src=\"https:\/\/nanotechvietnam.com\/wp-content\/uploads\/2022\/01\/Nghiem-thu-waxtape-scaled.jpg\" data-orig-src=\"https:\/\/nanotechvietnam.com\/wp-content\/uploads\/2022\/01\/Nghiem-thu-waxtape-scaled.jpg\" alt=\"Method of surface protection with anti-corrosion tape\" width=\"2560\" height=\"1920\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20width%3D%272560%27%20height%3D%271920%27%20viewBox%3D%270%200%202560%201920%27%3E%3Crect%20width%3D%272560%27%20height%3D%271920%27%20fill-opacity%3D%220%22%2F%3E%3C%2Fsvg%3E\" data-srcset=\"https:\/\/nanotechvietnam.com\/wp-content\/uploads\/2022\/01\/Nghiem-thu-waxtape-200x150.jpg 200w, https:\/\/nanotechvietnam.com\/wp-content\/uploads\/2022\/01\/Nghiem-thu-waxtape-300x225.jpg 300w, https:\/\/nanotechvietnam.com\/wp-content\/uploads\/2022\/01\/Nghiem-thu-waxtape-400x300.jpg 400w, https:\/\/nanotechvietnam.com\/wp-content\/uploads\/2022\/01\/Nghiem-thu-waxtape-600x450.jpg 600w, https:\/\/nanotechvietnam.com\/wp-content\/uploads\/2022\/01\/Nghiem-thu-waxtape-scaled-700x525.jpg 700w, https:\/\/nanotechvietnam.com\/wp-content\/uploads\/2022\/01\/Nghiem-thu-waxtape-768x576.jpg 768w, https:\/\/nanotechvietnam.com\/wp-content\/uploads\/2022\/01\/Nghiem-thu-waxtape-800x600.jpg 800w, https:\/\/nanotechvietnam.com\/wp-content\/uploads\/2022\/01\/Nghiem-thu-waxtape-1024x768.jpg 1024w, https:\/\/nanotechvietnam.com\/wp-content\/uploads\/2022\/01\/Nghiem-thu-waxtape-1200x900.jpg 1200w, https:\/\/nanotechvietnam.com\/wp-content\/uploads\/2022\/01\/Nghiem-thu-waxtape-1536x1152.jpg 1536w, https:\/\/nanotechvietnam.com\/wp-content\/uploads\/2022\/01\/Nghiem-thu-waxtape-scaled.jpg 2560w\" data-sizes=\"auto\" data-orig-sizes=\"(max-width: 2560px) 100vw, 2560px\" title=\"\"><\/p>\n<h1><span class=\"ez-toc-section\" id=\"References\"><\/span><span style=\"color: #3366ff;\">References:<\/span><span class=\"ez-toc-section-end\"><\/span><\/h1>\n<ol>\n<li><a href=\"https:\/\/nanotechvietnam.com\/en\/giai-phap-chong-an-mon-cho-kim-loai-tot-nhat-hien-nay\/\"><span style=\"color: #3366ff;\">The best anti-corrosion solution for metal today<\/span><\/a><\/li>\n<li><a href=\"https:\/\/nanotechvietnam.com\/en\/nhung-hieu-biet-ve-son-cong-nghiep\/\"><span style=\"color: #3366ff;\">Knowledge of industrial paints<\/span><\/a><\/li>\n<li><a href=\"https:\/\/nanotechvietnam.com\/en\/lam-sach-be-mat-kim-loai-bang-phuong-phap-phun-cat\/\"><span style=\"color: #3366ff;\">Cleaning metal surfaces by sandblasting<\/span><\/a><\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>According to statistics, the average amount of metal corroded annually in the world is about 10-30% of the volume of [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":2603,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[64],"tags":[],"_links":{"self":[{"href":"https:\/\/nanotechvietnam.com\/en\/wp-json\/wp\/v2\/posts\/2734"}],"collection":[{"href":"https:\/\/nanotechvietnam.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nanotechvietnam.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nanotechvietnam.com\/en\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/nanotechvietnam.com\/en\/wp-json\/wp\/v2\/comments?post=2734"}],"version-history":[{"count":2,"href":"https:\/\/nanotechvietnam.com\/en\/wp-json\/wp\/v2\/posts\/2734\/revisions"}],"predecessor-version":[{"id":2788,"href":"https:\/\/nanotechvietnam.com\/en\/wp-json\/wp\/v2\/posts\/2734\/revisions\/2788"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nanotechvietnam.com\/en\/wp-json\/wp\/v2\/media\/2603"}],"wp:attachment":[{"href":"https:\/\/nanotechvietnam.com\/en\/wp-json\/wp\/v2\/media?parent=2734"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nanotechvietnam.com\/en\/wp-json\/wp\/v2\/categories?post=2734"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nanotechvietnam.com\/en\/wp-json\/wp\/v2\/tags?post=2734"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}