{"id":7332,"date":"2026-01-21T09:24:01","date_gmt":"2026-01-21T12:24:01","guid":{"rendered":"https:\/\/www.wgbengenharia.com\/?p=7332"},"modified":"2026-01-21T09:33:43","modified_gmt":"2026-01-21T12:33:43","slug":"corrosao-de-armaduras","status":"publish","type":"post","link":"https:\/\/www.wgbengenharia.com\/en\/corrosao-de-armaduras\/","title":{"rendered":"Armor Corrosion: Causes, Mechanisms, and Repair Solutions"},"content":{"rendered":"

Currently, reinforcement corrosion is the most common pathology in reinforced concrete structures older than 10 years. According to technical surveys, it is responsible for approximately 70% of serious structural deteriorations in Brazil. Therefore, understanding its electrochemical mechanisms, correctly identifying its causes, and, above all, applying appropriate technical solutions is essential to preserving the service life of buildings.<\/p>\n\n\n\n

Furthermore, it is a silent and progressive process. In aggressive environments, for example, a corroded steel bar can lose approximately 10% of its cross-section every 3 to 5 years. As a direct consequence, the deterioration progresses without evident signs until, unexpectedly, a sudden failure occurs, often with catastrophic consequences.<\/p>\n\n\n\n

Given this context, this technical guide presents, in a structured way, the mechanisms of corrosion, the two main aggressive agents, carbonation and chlorides, as well as diagnostic methods, prevention strategies and structural recovery techniques.<\/p>\n\n\n\n

\n\n\n\n

The Electrochemical Mechanism: Why Steel Corrodes into Concrete<\/h2>\n\n\n\n

Passivating Layer: The Natural Protection<\/h3>\n\n\n\n

Under normal design and construction conditions, concrete naturally protects steel through a fundamental physical-chemical mechanism essential for structural durability. This process occurs as follows:<\/p>\n\n\n\n

Alkaline concrete (pH 12-13) \u2193 Formation of a passivating layer of Fe(OH)\u2082 \u2193 Stable and impermeable layer \u2193 Steel protected for a long period\n<\/code><\/pre>\n\n\n\n
This protective layer is mainly composed of:<\/p>\n\n\n\n
    \n
  • Stable iron oxide (Fe\u2082O\u2083)<\/li>\n\n\n\n
  • Iron hydroxide (Fe(OH)\u2082)<\/li>\n\n\n\n
  • Thickness between 0.1 and 1.0 micrometer<\/li>\n<\/ul>\n\n\n\n
    Specifically, this passivating film forms the basis of the durability of reinforced concrete, provided its conditions are maintained.<\/p>\n\n\n\n
    \n\n\n\n
    Depassivation: When Protection Fails<\/h3>\n\n\n\n
    However, this protection is not permanent. When the pH of the concrete decreases or when chloride ions reach the reinforcement, a process called depassivation occurs.<\/p>\n\n\n\n
    Aggressive agents (CO\u2082 or Cl\u207b) \u2193 Penetration through pores and fissures \u2193 Attack on the passivating layer \u2193 DEPASSIVATION \u2193 Steel exposed to corrosive environment\n<\/code><\/pre>\n\n\n\n
    From this point on, therefore, the steel is no longer protected and the corrosive process begins to develop continuously.<\/p>\n\n\n\n
    \n\n\n\n
    Electrochemical Corrosion Process<\/h2>\n\n\n\n
    Once depassivated, the armor undergoes electrochemical reactions that occur simultaneously in three distinct stages.<\/p>\n\n\n\n
    Step 1: Anodic Reaction (Oxidation of Steel)<\/h3>\n\n\n\n
    Fe \u2192 Fe\u00b2\u207a + 2e\u207b\n<\/code><\/pre>\n\n\n\n
    In this initial stage, metallic iron loses electrons. Thus, the anodic region is formed, where corrosion effectively begins.<\/p>\n\n\n\n
    Step 2: Cathodic Reaction (Oxygen Consumption)<\/h3>\n\n\n\n
    O\u2082 + 2H\u2082O + 4e\u207b \u2192 4OH\u207b\n<\/code><\/pre>\n\n\n\n
    Meanwhile, the released electrons are consumed in nearby regions, allowing the process to continue.<\/p>\n\n\n\n
    Stage 3: Formation of Corrosion Products<\/h3>\n\n\n\n
    Fe\u00b2\u207a + 2OH\u207b \u2192 Fe(OH)\u2082 2Fe(OH)\u2082 + O\u2082 \u2192 2Fe(OH)\u2083\n<\/code><\/pre>\n\n\n\n
    At this point, corrosion products are formed. Since these products have a volume between 4 and 10 times greater than the original steel, internal stresses arise which, consequently, cause cracking, detachment of the concrete cover, and exposure of the reinforcement.<\/p>\n\n\n\n
    \n\n\n\n
    Necessary Conditions for Corrosion<\/h3>\n\n\n\n
    In summary, corrosion only occurs when all of the following conditions are present:<\/p>\n\n\n\n
    1. Electrolyte (water in the pores) 2. Potential difference 3. Oxygen 4. Aggressive agents (CO\u2082 or Cl\u207b)\n<\/code><\/pre>\n\n\n\n
    Thus, the absence of any one of these conditions prevents corrosion. On the other hand, when all are simultaneously present, the process becomes inevitable.<\/p>\n\n\n\n
    \n\n\n\n
    Two Main Causes: Carbonation vs. Chlorides<\/h2>\n\n\n\n
    Although the end result is similar, loss of reinforcement section, the mechanisms involved are distinct and require different approaches.<\/p>\n\n\n\n
    \n\n\n\n
    Cause 1: Carbonation (\u224860% of cases)<\/h3>\n\n\n\n
    Chemical Mechanism<\/h4>\n\n\n\n
    CO\u2082 + H\u2082O \u2192 H\u2082CO\u2083 H\u2082CO\u2083 + Ca(OH)\u2082 \u2192 CaCO\u2083 + H\u2082O \u2193 pH drops from 12-13 to <9 \u2193 Destruction of the passivating layer\n<\/code><\/pre>\n\n\n\n
    In other words, carbonation reduces the alkalinity of the concrete, making the steel vulnerable.<\/p>\n\n\n\n
    Factors that accelerate carbonation.<\/h4>\n\n\n\n
    Factor<\/th>Impact<\/th><\/tr><\/thead>
    Low coverage<\/td>Progress 5\u201310 times faster<\/td><\/tr>
    Porous concrete<\/td>Rate 3\u20135 times higher<\/td><\/tr>
    Inadequate cure<\/td>High porosity<\/td><\/tr>
    Urban environment<\/td>Carbonation 2x faster<\/td><\/tr>
    Cracking<\/td>Direct pathways for CO\u2082<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    Penetration Speed<\/h4>\n\n\n\n
    Dense concrete: 1\u20132 mm\/year; Porous concrete: 5\u201310 mm\/year; Cracked concrete: >20 mm\/year\n<\/code><\/pre>\n\n\n\n
    Consequently, reduced concrete cover can lead to corrosion within a few years.<\/p>\n\n\n\n
    \n\n\n\n
    Cause 2: Chlorides (\u224840% of severe cases)<\/h3>\n\n\n\n
    Unlike carbonation, chlorides do not need to lower the pH to cause corrosion.<\/p>\n\n\n\n
    Cl\u207b \u2192 Reach the armor \u2193 Destabilize the passivating layer \u2193 Formation of localized pits \u2193 Rapid and aggressive corrosion\n<\/code><\/pre>\n\n\n\n
    Furthermore, this mechanism is autocatalytic, which makes its evolution much faster and more unpredictable.<\/p>\n\n\n\n
    Source<\/th>Content<\/th>Environment<\/th><\/tr><\/thead>
    Sea breeze<\/td>1\u20135%<\/td>Coastal<\/td><\/tr>
    Road exits<\/td>2\u201310%<\/td>Highways<\/td><\/tr>
    Inadequate additives<\/td>0,5\u20132%<\/td>Poorly supervised construction projects<\/td><\/tr>
    Contaminated aggregates<\/td>0,1\u20130,5%<\/td>Coastal regions<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    \n\n\n\n
    Diagnosis: Identifying Corrosion<\/h2>\n\n\n\n
    Visual Signs<\/h3>\n\n\n\n
    Level 1 \u2013 Suspected: \u2022 Grayish stains \u2022 Efflorescence \u2022 Surface disintegration Level 2 \u2013 Confirmed: \u2022 Cracks parallel to the reinforcement \u2022 Detachment of the concrete cover \u2022 Visible steel\n<\/code><\/pre>\n\n\n\n
    Therefore, visual cues should never be ignored.<\/p>\n\n\n\n
    \n\n\n\n
    Technical Diagnostic Methods<\/h3>\n\n\n\n
    Carbonation Assay (Phenolphthalein)<\/h4>\n\n\n\n
    Pink: High pH White: Low pH\n<\/code><\/pre>\n\n\n\n
    Corrosion Potential (CSE)<\/h4>\n\n\n\n
    > -200 mV: Low probability -200 to -350 mV: Uncertain probability < -350 mV: High probability\n<\/code><\/pre>\n\n\n\n
    Electrical Resistivity<\/h4>\n\n\n\n
    >10 k\u03a9\u00b7cm: Slow corrosion <1 k\u03a9\u00b7cm: Accelerated corrosion\n<\/code><\/pre>\n\n\n\n
    \n\n\n\n
    Prevention: The Most Economical Strategy<\/h2>\n\n\n\n
    It has been proven that prevention is up to 100 times cheaper than repair.<\/p>\n\n\n\n
    Measure 1: Adequate Coverage (NBR 6118)<\/h3>\n\n\n\n
    Environmental Class<\/th>Cover<\/th><\/tr><\/thead>
    CAA I<\/td>25 mm<\/td><\/tr>
    CAA II<\/td>30 mm<\/td><\/tr>
    CAA III<\/td>40 mm<\/td><\/tr>
    CAA IV<\/td>50 mm<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    Therefore, increasing the concrete cover can triple the lifespan of the structure.<\/p>\n\n\n\n
    \n\n\n\n
    Measure 2: Concrete Quality<\/h3>\n\n\n\n
    Air-to-energy ratio 0.65 \u2192 Lifespan ~10 years; Air-to-energy ratio 0.55 \u2192 Lifespan ~20 years; Air-to-energy ratio 0.45 \u2192 Lifespan >40 years\n<\/code><\/pre>\n\n\n\n
    \n\n\n\n
    Measure 3: Mineral Additions<\/h3>\n\n\n\n
    Furthermore, activated silica densifies the matrix and drastically reduces permeability, increasing service life by up to 80%.<\/p>\n\n\n\n
    \n\n\n\n
    Measure 4: Steel Protection<\/h3>\n\n\n\n
      \n
    • Galvanized steel: 3 to 5 times increase in durability.<\/li>\n\n\n\n
    • Stainless steel: use restricted to extreme cases.<\/li>\n<\/ul>\n\n\n\n
      \n\n\n\n
      Step 5: Proper Healing<\/h3>\n\n\n\n
      Without proper curing, strength decreases and carbonation accelerates. Therefore, a minimum wet curing period of 14 days is recommended.<\/p>\n\n\n\n
      \n\n\n\n
      Recovery: Repair Techniques<\/h2>\n\n\n\n
      Standard Steps<\/h3>\n\n\n\n
        \n
      1. Area delimitation<\/li>\n\n\n\n
      2. Removal of deteriorated concrete<\/li>\n\n\n\n
      3. Thorough cleaning of the armor<\/li>\n\n\n\n
      4. Corrosion protection<\/li>\n\n\n\n
      5. Adhesion bridge<\/li>\n\n\n\n
      6. Filling with polymer mortar<\/li>\n\n\n\n
      7. Surface protection<\/li>\n<\/ol>\n\n\n\n
        \n\n\n\n
        Conclusion: Corrosion is Preventable<\/h2>\n\n\n\n
        In summary, reinforcement corrosion is a completely preventable problem when proper design, correct materials, and quality workmanship are adopted.<\/p>\n\n\n\n
        Therefore, saving 5% in the design phase can later result in costs 50 to 100 times higher. In structural engineering, durability is not an additional cost, it is a strategic investment.<\/p>","protected":false},"excerpt":{"rendered":"
        Atualmente, a corros\u00e3o de armadura \u00e9 a patologia mais recorrente em estruturas de concreto armado com mais de 10 anos. De acordo com levantamentos t\u00e9cnicos, ela \u00e9 respons\u00e1vel por cerca de 70% das deteriora\u00e7\u00f5es estruturais graves no Brasil. Portanto, compreender seus mecanismos eletroqu\u00edmicos, identificar corretamente suas causas e, sobretudo, aplicar solu\u00e7\u00f5es t\u00e9cnicas adequadas \u00e9 essencial para preservar a vida \u00fatil das edifica\u00e7\u00f5es. Al\u00e9m disso, trata-se de um processo silencioso e progressivo. Em ambientes agressivos, por exemplo, uma barra de a\u00e7o corro\u00edda pode perder aproximadamente 10% de sua se\u00e7\u00e3o transversal a cada 3 a 5 anos. Como consequ\u00eancia direta, a deteriora\u00e7\u00e3o avan\u00e7a sem sinais evidentes at\u00e9 que, inesperadamente, ocorre uma falha s\u00fabita, muitas vezes com car\u00e1ter catastr\u00f3fico. Diante desse contexto, este guia t\u00e9cnico apresenta, de forma estruturada, os mecanismos da corros\u00e3o, os dois principais agentes agressivos, carbonata\u00e7\u00e3o e cloretos, bem como m\u00e9todos de diagn\u00f3stico, estrat\u00e9gias de preven\u00e7\u00e3o e t\u00e9cnicas de recupera\u00e7\u00e3o estrutural. O Mecanismo Eletroqu\u00edmico: Por Que o A\u00e7o Corr\u00f3i em Concreto Camada Passivadora: A Prote\u00e7\u00e3o Natural Em condi\u00e7\u00f5es normais de projeto e execu\u00e7\u00e3o, o concreto protege naturalmente o a\u00e7o por meio de um mecanismo f\u00edsico-qu\u00edmico fundamental para a durabilidade estrutural. Esse processo ocorre da seguinte forma: Essa camada protetora \u00e9 composta, principalmente, por: Especificamente, essa pel\u00edcula passivadora constitui a base da durabilidade do concreto armado, desde que suas condi\u00e7\u00f5es sejam mantidas. Despassiva\u00e7\u00e3o: Quando a Prote\u00e7\u00e3o Falha Entretanto, essa prote\u00e7\u00e3o n\u00e3o \u00e9 permanente. Quando o pH do concreto diminui ou quando \u00edons cloreto atingem a armadura, ocorre a chamada despassiva\u00e7\u00e3o: A partir desse ponto, portanto, o a\u00e7o deixa de estar protegido e o processo corrosivo passa a se desenvolver de forma cont\u00ednua. Processo Eletroqu\u00edmico de Corros\u00e3o Uma vez despassivada, a armadura passa a sofrer rea\u00e7\u00f5es eletroqu\u00edmicas que ocorrem simultaneamente em tr\u00eas etapas distintas. Etapa 1: Rea\u00e7\u00e3o An\u00f3dica (Oxida\u00e7\u00e3o do A\u00e7o) Nesse est\u00e1gio inicial, o ferro met\u00e1lico perde el\u00e9trons. Assim, forma-se a regi\u00e3o an\u00f3dica, onde a corros\u00e3o efetivamente se inicia. Etapa 2: Rea\u00e7\u00e3o Cat\u00f3dica (Consumo de Oxig\u00eanio) Enquanto isso, os el\u00e9trons liberados s\u00e3o consumidos em regi\u00f5es pr\u00f3ximas, permitindo que o processo continue ativo. Etapa 3: Forma\u00e7\u00e3o dos Produtos de Corros\u00e3o Nesse momento, formam-se os produtos de corros\u00e3o. Como esses produtos apresentam volume entre 4 e 10 vezes maior que o a\u00e7o original, surgem tens\u00f5es internas que, consequentemente, provocam fissura\u00e7\u00e3o, destacamento do cobrimento e exposi\u00e7\u00e3o das armaduras. Condi\u00e7\u00f5es Necess\u00e1rias para a Corros\u00e3o De forma resumida, a corros\u00e3o somente ocorre quando todas as condi\u00e7\u00f5es abaixo est\u00e3o presentes: Assim, a aus\u00eancia de qualquer uma dessas condi\u00e7\u00f5es impede a corros\u00e3o. Por outro lado, quando todas est\u00e3o simultaneamente presentes, o processo se torna inevit\u00e1vel. Duas Principais Causas: Carbonata\u00e7\u00e3o vs. Cloretos Embora o resultado final seja semelhante, perda de se\u00e7\u00e3o da armadura, os mecanismos envolvidos s\u00e3o distintos e exigem abordagens diferentes. Causa 1: Carbonata\u00e7\u00e3o (\u224860% dos casos) Mecanismo Qu\u00edmico Ou seja, a carbonata\u00e7\u00e3o reduz a alcalinidade do concreto, tornando o a\u00e7o vulner\u00e1vel. Fatores que Aceleram a Carbonata\u00e7\u00e3o Fator Impacto Cobrimento baixo Avan\u00e7o 5\u201310x mais r\u00e1pido Concreto poroso Taxa 3\u20135x maior Cura inadequada Porosidade elevada Ambiente urbano Carbonata\u00e7\u00e3o 2x mais r\u00e1pida Fissura\u00e7\u00e3o Caminhos diretos para CO\u2082 Velocidade de Penetra\u00e7\u00e3o Consequentemente, cobrimentos reduzidos podem levar a corros\u00e3o em poucos anos. Causa 2: Cloretos (\u224840% dos casos graves) Diferentemente da carbonata\u00e7\u00e3o, os cloretos n\u00e3o necessitam reduzir o pH para provocar corros\u00e3o. Al\u00e9m disso, esse mecanismo \u00e9 autocatal\u00edtico, o que torna sua evolu\u00e7\u00e3o muito mais r\u00e1pida e imprevis\u00edvel. Fonte Teor Ambiente Maresia 1\u20135% Costeiro Sais rodovi\u00e1rios 2\u201310% Rodovias Aditivos inadequados 0,5\u20132% Obras mal controladas Agregados contaminados 0,1\u20130,5% Regi\u00f5es litor\u00e2neas Diagn\u00f3stico: Identificando a Corros\u00e3o Sinais Visuais Portanto, sinais visuais nunca devem ser ignorados. M\u00e9todos T\u00e9cnicos de Diagn\u00f3stico Ensaio de Carbonata\u00e7\u00e3o (Fenolftale\u00edna) Potencial de Corros\u00e3o (CSE) Resistividade El\u00e9trica Preven\u00e7\u00e3o: A Estrat\u00e9gia Mais Econ\u00f4mica Comprovadamente, prevenir \u00e9 at\u00e9 100 vezes mais barato do que reparar. Medida 1: Cobrimento Adequado (NBR 6118) Classe Ambiental Cobrimento CAA I 25 mm CAA II 30 mm CAA III 40 mm CAA IV 50 mm Assim, aumentar o cobrimento pode triplicar a vida \u00fatil da estrutura. Medida 2: Qualidade do Concreto Medida 3: Adi\u00e7\u00f5es Minerais Al\u00e9m disso, a s\u00edlica ativa densifica a matriz e reduz drasticamente a permeabilidade, aumentando a vida \u00fatil em at\u00e9 80%. Medida 4: Prote\u00e7\u00e3o do A\u00e7o Medida 5: Cura Adequada Sem cura adequada, a resist\u00eancia diminui e a carbonata\u00e7\u00e3o acelera. Portanto, recomenda-se cura \u00famida m\u00ednima de 14 dias. Recupera\u00e7\u00e3o: T\u00e9cnicas de Repara\u00e7\u00e3o Etapas Padr\u00e3o Conclus\u00e3o: Corros\u00e3o \u00e9 Evit\u00e1vel Em s\u00edntese, a corros\u00e3o da armadura \u00e9 uma patologia totalmente evit\u00e1vel quando se adota projeto adequado, materiais corretos e execu\u00e7\u00e3o de qualidade. Portanto, economizar 5% na fase de projeto pode resultar, posteriormente, em custos 50 a 100 vezes maiores. Em engenharia estrutural, durabilidade n\u00e3o \u00e9 custo adicional, \u00e9 investimento estrat\u00e9gico.<\/p>","protected":false},"author":2,"featured_media":7333,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_wgb_auto_generated":"","_wgb_pair_post_id":0,"footnotes":""},"categories":[42],"tags":[278],"class_list":["post-7332","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-laudos","tag-laudo-tecnico"],"acf":[],"yoast_head":"\nCorros\u00e3o de Armadura: Causas, Mecanismos e Solu\u00e7\u00f5es de Recupera\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Entenda as causas da corros\u00e3o de armaduras em concreto armado, seus mecanismos, m\u00e9todos de diagn\u00f3stico e as principais solu\u00e7\u00f5es de preven\u00e7\u00e3o e recupera\u00e7\u00e3o estrutural.\" \/>\n<meta name=\"robots\" content=\"index, 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