{"id":9343,"date":"2026-07-07T18:16:38","date_gmt":"2026-07-07T14:46:38","guid":{"rendered":"https:\/\/klevers-aryana.com\/?p=9343"},"modified":"2026-07-07T18:25:39","modified_gmt":"2026-07-07T14:55:39","slug":"what-is-metal-corrosion-a-review-of-types-chemical-process-and-modern-prevention-methods","status":"publish","type":"post","link":"https:\/\/www.klevers-aryana.com\/en\/articles\/what-is-metal-corrosion-a-review-of-types-chemical-process-and-modern-prevention-methods\/","title":{"rendered":"What is Metal Corrosion? A Review of Types, Chemical Process, and Modern Prevention Methods"},"content":{"rendered":"<?xml encoding=\"UTF-8\"><p class=\"wp-block-paragraph\">Corrosion is one of the most inevitable natural phenomena in the world of industry and materials engineering, causing billions of dollars in damage annually to infrastructure, industrial pipelines, bridges, and factory equipment. But what exactly is <strong>metal corrosion<\/strong>, why does it happen, and how can it be controlled or repaired?<\/p><p class=\"wp-block-paragraph\">Many people simply equate corrosion with &#8220;rusting&#8221;; while rusting is only a small window into the complex and destructive world of corrosion. In this article, we aim to examine the contexts, mechanisms, and solutions for dealing with this chemical phenomenon in simple yet technical and practical language.<\/p><h2 id=\"h-what-is-metal-corrosion-definition-in-simple-terms\" class=\"wp-block-heading\">What is Metal Corrosion? (Definition in Simple Terms)<\/h2><p class=\"wp-block-paragraph\">If we want to answer the question <strong>what is metal corrosion?<\/strong> in simple terms, it can be said: Corrosion is a natural and spontaneous process during which a pure and processed metal, due to chemical or electrochemical reactions with its surrounding environment, is destroyed and returns to its more chemically stable form (such as oxide, hydroxide, or sulfide).<\/p><figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/www.klevers-aryana.com\/wp-content\/uploads\/2026\/06\/%D8%AE%D9%88%D8%B1%D8%AF%DA%AF%DB%8C-%D9%81%D9%84%D8%B2%D8%A7%D8%AA-%D8%AC%DB%8C%D8%B3%D8%AA%D8%9F-1024x683.png\" alt=\"Figure 1: The spontaneous oxidation process and the tendency of metals to return to the stable state of ore in nature.\" class=\"wp-image-9291\"><figcaption class=\"wp-element-caption\"><em>Figure 1: The spontaneous oxidation process and the tendency of metals to return to the stable state of ore in nature.<\/em><\/figcaption><\/figure><p class=\"wp-block-paragraph\">In fact, to produce metals like iron, copper, or aluminum, humans expend a lot of energy in furnaces to reduce and purify ore. The resulting metal has a high energy level and, according to the laws of thermodynamics, always tends to lose electrons and return to its original, lower, and more stable energy level (i.e., the oxide or ore). This return journey of the metal to its origin is <strong>corrosion<\/strong>.<\/p><h2 id=\"h-what-is-the-difference-between-corrosion-and-rusting\" class=\"wp-block-heading\">What is the Difference Between Corrosion and Rusting?<\/h2><p class=\"wp-block-paragraph\">A common mistake in general language is the interchangeable use of the two terms &#8220;Corrosion&#8221; and &#8220;Rusting.&#8221; The main difference lies in their scope:<\/p><ol class=\"wp-block-list\">\n<li><strong>Corrosion:<\/strong> A general term for all metals (iron, copper, aluminum, zinc, steel, etc.) and even non-metals (such as polymers and ceramics) that are degraded due to reaction with the environment.<\/li>\n\n\n\n<li><strong>Rusting:<\/strong> A specific type of corrosion that occurs <strong>only and exclusively for iron and iron-containing alloys (such as steel)<\/strong>. The product of rusting is hydrated iron oxide (reddish-brown in color).<\/li>\n<\/ol><p class=\"wp-block-paragraph\">Therefore, every rusting is a type of corrosion, but not every corrosion is necessarily rusting. For example, when copper oxidizes and creates a green patina, or aluminum tarnishes, they have undergone corrosion, but they have not rusted.<\/p><h2 id=\"h-mechanism-and-chemical-process-of-metal-corrosion\" class=\"wp-block-heading\">Mechanism and Chemical Process of Metal Corrosion<\/h2><p class=\"wp-block-paragraph\">From a chemical perspective, corrosion is mainly an electrochemical process. This means that for corrosion to occur, a &#8220;miniature galvanic cell&#8221; is needed on the metal surface, which includes four main elements:<\/p><ul class=\"wp-block-list\">\n<li><strong>Anode:<\/strong> The part of the metal that loses electrons, oxidizes, and deteriorates.<\/li>\n\n\n\n<li><strong>Cathode:<\/strong> The part of the metal that attracts the released electrons.<\/li>\n\n\n\n<li><strong>Electrolyte:<\/strong> A liquid or moist environment that allows ions to move (such as water, air humidity, or acidic and saline solutions).<\/li>\n\n\n\n<li><strong>Electrically Conductive Path:<\/strong> The metal body itself, which transfers electrons from the anode to the cathode.<\/li>\n<\/ul><pre class=\"wp-block-code\"><code>Anodic reaction (Oxidation): M &rarr; M&#8319;&#8314; + ne&#8315;  (Metal dissolves)\nCathodic reaction (Reduction): O&#8322; + 2H&#8322;O + 4e&#8315; &rarr; 4OH&#8315; (in neutral and moist environments)<\/code><\/pre><p class=\"wp-block-paragraph\">The higher the concentration of aggressive ions (such as chloride ions in seawater) or the amount of moisture and oxygen in the environment, the faster the movement of these ions in the electrolyte increases, and consequently, the rate of metal corrosion rises sharply. For a deeper understanding of anodic and cathodic reactions and their governing equations, we recommend reading our specialized article titled <a href=\"https:\/\/klevers-aryana.com\/articles\/metal-corrosion\/\">Metal Corrosion: A Comprehensive Guide to Mechanisms and Control Methods<\/a>.<\/p><h2 id=\"h-key-factors-intensifying-metal-corrosion\" class=\"wp-block-heading\">Key Factors Intensifying Metal Corrosion<\/h2><p class=\"wp-block-paragraph\">The rate of metal degradation is not uniform and depends on various environmental and metallurgical factors:<\/p><ul class=\"wp-block-list\">\n<li><strong>Moisture and Oxygen:<\/strong> The two main wings of corrosion flight. In completely dry air, iron does not rust.<\/li>\n\n\n\n<li><strong>Environmental pH Level:<\/strong> Acidic environments (low pH) due to the abundance of $H^+$ ions, significantly accelerate the cathodic reaction and dissolve the protective layers of the metal.<\/li>\n\n\n\n<li><strong>Temperature:<\/strong> According to the laws of chemical kinetics, the rate of reactions increases with rising temperature. Continuous temperature changes also open the way for the penetration of corrosive agents by creating cracks in protective layers.<\/li>\n\n\n\n<li><strong>Presence of Salts and Chloride Ions:<\/strong> Chlorides (found in seawater or salted roads) are the main enemy of Stainless Steel and easily break through its protective passive layer.<\/li>\n<\/ul><h2 id=\"h-brief-introduction-to-types-of-metal-corrosion\" class=\"wp-block-heading\">Brief Introduction to Types of Metal Corrosion<\/h2><p class=\"wp-block-paragraph\">Corrosion does not always appear in the same form. Depending on the mechanical conditions, part geometry, and type of environment, corrosion is divided into different types, knowledge of which is essential for engineers:<\/p><ol class=\"wp-block-list\">\n<li><strong>Uniform Corrosion:<\/strong> The most superficial and predictable type of corrosion that attacks the entire metal surface evenly.<\/li>\n\n\n\n<li><strong>Galvanic Corrosion:<\/strong> Occurs when two dissimilar metals (e.g., copper and iron) are connected in an electrolyte; the more active metal (anode) is rapidly sacrificed and degraded.<\/li>\n\n\n\n<li><strong>Pitting Corrosion:<\/strong> Extremely dangerous and localized; creates deep pinpoint holes that make the structure appear healthy on the outside but perforate the part from within.<\/li>\n\n\n\n<li><strong>Crevice Corrosion:<\/strong> Occurs in tight spaces and gaps of bolts and flanges where oxygen is less available.<\/li>\n<\/ol><p class=\"wp-block-paragraph\">Follow the detailed analysis along with microscopic and metallographic images of each of these cases in the second part of the article <a href=\"https:\/\/klevers-aryana.com\/articles\/metal-corrosion\/\">Comprehensive Guide to Corrosion Mechanisms<\/a>.<\/p><figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"683\" height=\"1024\" src=\"https:\/\/www.klevers-aryana.com\/wp-content\/uploads\/2026\/06\/image-1-683x1024.png\" alt=\"\" class=\"wp-image-9288\" srcset=\"https:\/\/www.klevers-aryana.com\/wp-content\/uploads\/2026\/06\/image-1-683x1024.png 683w, https:\/\/www.klevers-aryana.com\/wp-content\/uploads\/2026\/06\/image-1-200x300.png 200w, https:\/\/www.klevers-aryana.com\/wp-content\/uploads\/2026\/06\/image-1-768x1152.png 768w, https:\/\/www.klevers-aryana.com\/wp-content\/uploads\/2026\/06\/image-1.png 800w\" sizes=\"(max-width: 683px) 100vw, 683px\" \/><figcaption class=\"wp-element-caption\">Figure 2: Types of common corrosion in industry.<\/figcaption><\/figure><figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"612\" src=\"https:\/\/www.klevers-aryana.com\/wp-content\/uploads\/2026\/06\/image-1024x612.png\" alt=\"A view of damage concentration in localized pitting corrosion compared to uniform corrosion.\" class=\"wp-image-9285\" srcset=\"https:\/\/www.klevers-aryana.com\/wp-content\/uploads\/2026\/06\/image-1024x612.png 1024w, https:\/\/www.klevers-aryana.com\/wp-content\/uploads\/2026\/06\/image-300x179.png 300w, https:\/\/www.klevers-aryana.com\/wp-content\/uploads\/2026\/06\/image-768x459.png 768w, https:\/\/www.klevers-aryana.com\/wp-content\/uploads\/2026\/06\/image.png 1284w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><em>Figure 2: A view of damage concentration in localized pitting corrosion and its remediation by repair coatings.<\/em><\/figcaption><\/figure><h2 id=\"h-methods-for-preventing-and-controlling-corrosion\" class=\"wp-block-heading\">Methods for Preventing and Controlling Corrosion<\/h2><p class=\"wp-block-paragraph\">To control this invisible monster of industry, several strategies have been developed in surface engineering:<\/p><h3 id=\"h-1-selection-of-engineered-materials-and-alloying\" class=\"wp-block-heading\">1. Selection of Engineered Materials and Alloying<\/h3><p class=\"wp-block-paragraph\">The use of alloying elements such as chromium, nickel, and molybdenum creates a very thin, adherent, and impermeable chromium oxide layer (passive layer) on the steel surface, turning it into &#8220;stainless steel.&#8221;<\/p><h3 id=\"h-2-electrochemical-protection-cathodic-and-anodic\" class=\"wp-block-heading\">2. Electrochemical Protection (Cathodic and Anodic)<\/h3><p class=\"wp-block-paragraph\">In cathodic protection, by connecting a sacrificial anode (such as zinc or magnesium) or by applying an external current, the main metal is turned into the cathode of the cell to prevent it from corroding. This method is widely used in underground pipelines and ship hulls.<\/p><h3 id=\"h-3-application-of-barrier-coatings\" class=\"wp-block-heading\">3. Application of Barrier Coatings<\/h3><p class=\"wp-block-paragraph\">Industrial paints, epoxies, and ceramic coatings prevent moisture and oxygen from contacting the metal surface by creating a strong physical barrier. According to international standards such as <a href=\"https:\/\/www.astm.org\">ASTM<\/a> and <a href=\"https:\/\/www.iso.org\">ISO<\/a>, the quality and thickness of these coatings must be designed according to the corrosivity of the environment&#8217;s atmosphere.<\/p><h2 id=\"h-modern-methods-for-repairing-and-restoring-corroded-metals\" class=\"wp-block-heading\">Modern Methods for Repairing and Restoring Corroded Metals<\/h2><p class=\"wp-block-paragraph\">Prevention is not always successful. In many cases, industrial equipment suffers severe damage, thickness reduction, pitting corrosion, or leakage. In the past, the only solution was to replace the part or perform heavy welding, which itself created mechanical residual stresses and intensified intergranular corrosion.<\/p><p class=\"wp-block-paragraph\">Today, <strong>composites and structural corrosion repair adhesives<\/strong> have created a revolution in this field. <strong>Klevers Ariana<\/strong> company, as a pioneer in providing corrosion control solutions, has introduced an advanced product portfolio for repairing metal structures:<\/p><ul class=\"wp-block-list\">\n<li><strong>Metal-Reinforced Epoxy Polymers:<\/strong> These materials (such as two-component steel repair systems) have excellent adhesion to metal surfaces and, after hardening, are fully machinable, drillable, and amenable to mechanical processes. These products are used for filling corrosion pits, rebuilding corroded shafts, and repairing pump housings. For more information, you can refer to the specialized section on <a href=\"https:\/\/klevers-aryana.com\/articles\/corrosion-repair-paste\/\">Klevers Corrosion Repair Materials<\/a>.<\/li>\n\n\n\n<li><strong>Anti-Wear Ceramic Composites:<\/strong> A combination of curable polymer resins and ceramic particles of alumina or silicon carbide that, in addition to completely stopping the electrochemical corrosion process, multiplies the part&#8217;s resistance to erosive and turbulent flows (Erosion-Corrosion). Examine the details of this technology on the page for <a href=\"https:\/\/klevers-aryana.com\/en\/materials\/corrosion-repair-coatings\/\">Ceramic Repair and Anti-Corrosion Coatings<\/a>.<\/li>\n<\/ul><figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/www.klevers-aryana.com\/wp-content\/uploads\/2026\/02\/%DA%A9%D8%A7%D8%B1%D8%A8%D8%B1%D8%AF-%DA%86%D8%B3%D8%A8-%D8%B5%D9%86%D8%B9%D8%AA%DB%8C-1024x589.png\" alt=\"Figure 3: The process of geometric reconstruction and final coating of a damaged industrial equipment using epoxy-metal compounds.\" class=\"wp-image-9199\"><figcaption class=\"wp-element-caption\"><em>Figure 3: The process of geometric reconstruction and final coating of a damaged industrial equipment using epoxy-metal compounds.<\/em><\/figcaption><\/figure><h2 id=\"h-frequently-asked-questions-faq\" class=\"wp-block-heading\">Frequently Asked Questions (FAQ)<\/h2><h3 id=\"h-1-what-is-the-main-cause-of-metal-corrosion\" class=\"wp-block-heading\">1. What is the main cause of metal corrosion?<\/h3><p class=\"wp-block-paragraph\">The main cause is the natural tendency of metals to oxidize and return to their thermodynamically stable state (ore) through electrochemical reactions with environmental oxygen and moisture.<\/p><h3 id=\"h-2-can-stainless-steel-also-corrode\" class=\"wp-block-heading\">2. Can stainless steel also corrode?<\/h3><p class=\"wp-block-paragraph\">Yes. Stainless steel in oxygen-free environments (crevice corrosion) or in the strong presence of chloride ions (such as seawater or acids) undergoes severe localized corrosion such as pitting.<\/p><h3 id=\"h-3-what-is-the-best-method-for-repairing-leaks-in-corroded-pipes\" class=\"wp-block-heading\">3. What is the best method for repairing leaks in corroded pipes?<\/h3><p class=\"wp-block-paragraph\">The best and fastest industrial method without needing to stop the production line or welding is using structural repair composites and metal-reinforced epoxy adhesives (such as Klevers Ariana corrosion repair products) along with composite wrapping.<\/p><hr class=\"wp-block-separator has-alpha-channel-opacity\"><h2 id=\"h-conclusion\" class=\"wp-block-heading\">Conclusion<\/h2><p class=\"wp-block-paragraph\">In answering the question <strong>&#8220;What is metal corrosion?&#8221;<\/strong>, we realized that this phenomenon is an inevitable thermodynamic reaction; but with proper management, intelligent material selection, precise monitoring, and the use of modern polymeric and ceramic repair materials, its damage rate can be brought close to zero. Accurate knowledge of the corrosion mechanism allows us, before needing to replace expensive parts, to increase the useful life of industrial assets for decades by using modern coating and structural restoration technologies.<\/p>","protected":false},"excerpt":{"rendered":"<p>Corrosion is one of the most inevitable natural phenomena in the world of industry and materials engineering, causing billions of dollars in damage annually to infrastructure, industrial pipelines, bridges, and factory equipment. But what exactly is metal corrosion, why does&#8230;<\/p>\n","protected":false},"author":1,"featured_media":9294,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ai_generated_summary":"","footnotes":""},"categories":[89,88,30,5],"tags":[62],"class_list":["post-9343","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles-en","category-news-en","category-news","category-articles","tag-62"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.6 (Yoast SEO v22.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is Metal Corrosion? A Comprehensive Guide in Simple Terms + Control and Repair Methods<\/title>\n<meta name=\"description\" content=\"What is metal corrosion and how is it different from rusting? 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