[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-657121-105":59,"doc-detail-657121-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","corrosion-pourbaix-diagrams","Corrosion - Pourbaix Diagrams","","This document provides an overview of Pourbaix diagrams, also known as Eh-pH or potential-pH diagrams, which are electrochemical phase diagrams used in corrosion science. It outlines the contributions of Marcel Pourbaix, the originator of these diagrams and author of the Atlas of Electrochemical Equilibria in Aqueous Solutions. The content explains the theoretical basis for these diagrams, focusing on the Nernst equation, redox reactions, and the relationship between electrochemical potential and pH. The text further categorizes diagram features such as vertical lines representing acid-base reactions, horizontal lines indicating redox reactions, and sloped lines involving both proton and electron exchange. Finally, it describes the three primary regions of stability identified by these diagrams: corrosion, passivation, and immunity, providing a fundamental framework for understanding the thermodynamic stability of materials in aqueous environments.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/corrosion-pourbaix-diagrams/657121/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/corrosion-pourbaix-diagrams/657121.png","ImageObject",300,407,{"name":92,"@type":93},"The weather in my hometown","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-30","2026-10-26",true,{"@type":102,"interactionType":103,"userInteractionCount":44},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What are the three main stability regions shown on a Pourbaix diagram?","Question",{"text":112,"@type":113},"The three primary regions designated on a Pourbaix diagram are corrosion, passivation, and immunity.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What is the significance of the vertical lines in a Pourbaix diagram?",{"text":117,"@type":113},"Vertical lines represent acid-base reactions that are independent of electronic potential (Eh), involving no electron exchange.",{"name":119,"@type":110,"acceptedAnswer":120},"How are horizontal lines interpreted in the context of Pourbaix diagrams?",{"text":121,"@type":113},"Horizontal lines represent redox reactions that occur independently of pH, as they involve electron exchange without the net exchange of H+ or OH- ions.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},657121,1793115263,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":44,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145},1374408744247,"https://ap-avatar.wpscdn.com/avatar/14001251d37d565ec6f?x-image-process=image/resize,m_fixed,w_180,h_180&k=1790672120290115972","Corrosion – POURBAIX Diagrams  \nNicholas Grundy, Huahai Mao  \nMarcel POURBAIX  \n􀂃 Russian-born (1904 –1998) Belgian chemist and pianist.  \n􀂃 Studied corrosion @ University of Brussels  \n􀂃 Biggest achievement is the derivation of Eh-pH diagrams –a kind of electrochemical phase diagram .  \n􀂃 1st Eh-pH diagram presented in 1949  \n􀂃 1st Edition \"Atlas of Electrochemical Equilibria\", for all elements known at the time, published in 1963.  \nMarcel Pourbaix (1974): Atlas of Electrochemical Equilibria in Aqueous  \nSolutions, 2nd Ed, Houston, Tex ., National Association of Corrosion Engineers .  \nEh – pH Diagram  \npE-pH, Eo-pH, or potential-pH diagram  \nEh:  \n(standard hydrogen) electronic potential, represents the redox state, derived based on Nernst equation .  \n􀃆 Eh = MUR(ZE)/RNF  \nwhere RNF is the Faraday constant (96485.3)  \npH:  \nAcidity or concentration of  \n􀃆 pH = -log10[ACR(H+1,AQUEOUS)*AH2O]]  \nwhere AH2O is the molecular weight of the solvent H 2 O (55.5)  \nThe Nernst Equation  \nFor the electrochemical reduction reaction (cathodic reaction)  \nOx + z e− → Red  \nΔG = ΔG0 + RTlnQ Q is the reaction quotient.  \nΔG= -zFE, F is the Faraday constant,  \nE the electrochemical potential.  \nThe Nernst equation for an electrochemical half-cell is  \nPOURBAIX Diagrams-Basics  \nVertical lines:  \nNo e-exchange 􀃆 indep. of Eh Fe3+ 􀃆 Fe2 O3 or Fe2+ 􀃆 Fe(OH)2  \nAcid – Base reactions  \nPOURBAIX Diagrams-Basics  \nHorizontal lines:  \nNo H+ or OH- exchange 􀃆 independent of pH Fe3+ + e- 􀃆 Fe2+  \nFe2+ + 2e- 􀃆 Fe  \nRedox reactions  \nPOURBAIX Diagrams-Basics  \nSlopes lines:  \nH+ or OH- and e- exchange  \nPOURBAIX Diagrams-Basics  \nIncluding stability region of water  \n3 regions can be designated: Corrosion / Passivation / Immunity  \nCorrosion  \nPassivation  \nImmunity  \nPOURBAIX Diagrams-Basics  \nIncluding stability region of water  \n3 regions can be designated: Corrosion / Passivation / Immunity  \nCorrosion  \nPassivation  \nImmunity","cbCaikAkJXtl9F0W","https://ap.wps.com/l/cbCaikAkJXtl9F0W","pdf",2227543,31,"English","# Introduction to Marcel Pourbaix\n## Overview of Pourbaix Diagrams\n# Theoretical Foundation\n## The Nernst Equation\n## Eh and pH Definitions\n# Diagram Characteristics\n## Vertical, Horizontal, and Sloped Lines\n## Stability Regions: Corrosion, Passivation, and Immunity","[{\"question\":\"What are the three main stability regions shown on a Pourbaix diagram?\",\"answer\":\"The three primary regions designated on a Pourbaix diagram are corrosion, passivation, and immunity.\"},{\"question\":\"What is the significance of the vertical lines in a Pourbaix diagram?\",\"answer\":\"Vertical lines represent acid-base reactions that are independent of electronic potential (Eh), involving no electron exchange.\"},{\"question\":\"How are horizontal lines interpreted in the context of Pourbaix diagrams?\",\"answer\":\"Horizontal lines represent redox reactions that occur independently of pH, as they involve electron exchange without the net exchange of H+ or OH- ions.\"}]","Corrosion - Pourbaix Diagrams | PDF",1792974456,78]