{"id":3764,"date":"2026-03-21T08:46:38","date_gmt":"2026-03-21T08:46:38","guid":{"rendered":"https:\/\/npk1169-001-site1.mtempurl.com\/?p=3764"},"modified":"2026-04-13T07:37:39","modified_gmt":"2026-04-13T07:37:39","slug":"rust-proof-iron-the-delhi-pillar","status":"publish","type":"post","link":"https:\/\/www.bharatwisdom.com\/hi\/physics-and-chemistry\/rust-proof-iron-the-delhi-pillar\/","title":{"rendered":"Rust-Proof Iron (The Delhi Pillar) \u2013 The Masterpiece of Corrosion Science"},"content":{"rendered":"<div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 fusion-flex-container nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:1279.2px;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:1.92%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:1.92%;--awb-width-medium:100%;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-1\"><p id=\"p-rc_a25bdef117aa897d-1507\" data-path-to-node=\"88\"><span data-path-to-node=\"88,0\"><b data-path-to-node=\"88,0\" data-index-in-node=\"0\">\u0905\u0935\u0927\u093e\u0930\u0923\u093e<\/b> <\/span><span data-path-to-node=\"88,2\"><span class=\"citation-6500\">Iron rusts<\/span><\/span><span data-path-to-node=\"88,4\">. <\/span><span data-path-to-node=\"88,6\"><span class=\"citation-6499\">Iron degrades when it comes in contact with air and moisture<\/span><\/span><span data-path-to-node=\"88,8\">. <\/span><span data-path-to-node=\"88,10\"><span class=\"citation-6498\">To prevent this from happening, it usually has to painted or galvanised<\/span><\/span><span data-path-to-node=\"88,12\">.<\/span><\/p>\n<p id=\"p-rc_a25bdef117aa897d-1508\" data-path-to-node=\"89\"><span data-path-to-node=\"89,0\"><b data-path-to-node=\"89,0\" data-index-in-node=\"0\">\u0915\u0939\u093e\u0928\u0940<\/b> <\/span><span data-path-to-node=\"89,2\"><span class=\"citation-6497\">Deep in the heart of Delhi stands a massive iron pillar that has been exposed to the sun and rain for over 1,600 years\u2014yet it has not a single speck of rust<\/span><\/span><span data-path-to-node=\"89,4\">. <\/span><span data-path-to-node=\"89,6\"><span class=\"citation-6496\">While Western iron from the same era has long since crumbled into dust, this Gupta-era masterpiece used a secret &#8220;passivation&#8221; layer of high phosphorus<\/span><\/span><span data-path-to-node=\"89,8\">. <\/span><span data-path-to-node=\"89,10\"><span class=\"citation-6495\">It is a massive monument to ancient Indian metallurgy<\/span><\/span><span data-path-to-node=\"89,12\">. <\/span><span data-path-to-node=\"89,14\"><span class=\"citation-6494\">For centuries, Western scientists were baffled by it, eventually realizing that the ancient smiths had mastered &#8220;corrosion science&#8221; over a thousand years before the industrial age<\/span><\/span><span data-path-to-node=\"89,16\">.<\/span><\/p>\n<p data-path-to-node=\"90\"><b data-path-to-node=\"90\" data-index-in-node=\"0\">\u0938\u092e\u092f\u0930\u0947\u0916\u093e<\/b><\/p>\n<table data-path-to-node=\"91\">\n<thead>\n<tr>\n<td><strong>\u092e\u0940\u0932 \u0915\u093e \u092a\u0924\u094d\u0925\u0930<\/strong><\/td>\n<td><strong>\u0935\u093f\u0935\u0930\u0923<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><span data-path-to-node=\"91,1,0,0\"><b data-path-to-node=\"91,1,0,0\" data-index-in-node=\"0\">\u092a\u0936\u094d\u091a\u093f\u092e\u0940 \u0938\u0902\u0926\u0930\u094d\u092d.<\/b><\/span><\/td>\n<td>\n<p data-path-to-node=\"91,1,1,0\"><span data-path-to-node=\"91,1,1,0,1\"><span class=\"citation-6493\">1900s CE (Modern Stainless Steel) <\/span><\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"91,2,0,0\"><b data-path-to-node=\"91,2,0,0\" data-index-in-node=\"0\">\u092d\u093e\u0930\u0924\u0940\u092f \u0938\u094d\u0930\u094b\u0924<\/b><\/span><\/td>\n<td>\n<p data-path-to-node=\"91,2,1,0\"><span data-path-to-node=\"91,2,1,0,1\"><span class=\"citation-6492\">400 CE (Iron Pillar construction) <\/span><\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"91,3,0,0\"><b data-path-to-node=\"91,3,0,0\" data-index-in-node=\"0\">\u0915\u093e\u0932 \u0905\u0902\u0924\u0930\u093e\u0932<\/b><\/span><\/td>\n<td>\n<p data-path-to-node=\"91,3,1,0\"><span data-path-to-node=\"91,3,1,0,1\"><span class=\"citation-6491\">Over 1,500 Years <\/span><\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p data-path-to-node=\"92\"><b data-path-to-node=\"92\" data-index-in-node=\"0\">\u092e\u0942\u0932 \u092a\u093e\u0920<\/b><\/p>\n<blockquote data-path-to-node=\"93\">\n<p id=\"p-rc_a25bdef117aa897d-1509\" data-path-to-node=\"93,0\"><span data-path-to-node=\"93,0,0\"><b data-path-to-node=\"93,0,0\" data-index-in-node=\"0\">\u0938\u0902\u0938\u094d\u0915\u0943\u0924 \u0936\u094d\u0932\u094b\u0915:<\/b> \u092f\u0938\u094d\u092f\u094b\u0926\u094d\u0935\u0930\u094d\u0924\u092f\u0924\u0903 \u092a\u094d\u0930\u0924\u0940\u092a\u092e\u0941\u0930\u0938\u093e \u0936\u0924\u094d\u0930\u0942\u0928\u094d\u0938\u092e\u0947\u0924\u094d\u092f\u093e\u0917\u0924\u093e\u0928\u094d \u0964 <\/span><span data-path-to-node=\"93,0,2\"><span class=\"citation-6490\">\u0935\u0919\u094d\u0917\u0947\u0937\u094d\u0935\u093e\u0939\u0935\u0935\u0930\u094d\u0924\u093f\u0928\u094b\u092d\u093f\u0932\u093f\u0916\u093f\u0924\u093e \u0916\u0921\u094d\u0917\u0947\u0928 \u0915\u0940\u0930\u094d\u0924\u093f\u0930\u094d\u092d\u0941\u091c\u0947 \u0965 <\/span><\/span><span data-path-to-node=\"93,0,4\"> <b data-path-to-node=\"93,0,4\" data-index-in-node=\"1\">\u0932\u093f\u092a\u094d\u092f\u0902\u0924\u0930\u0923:<\/b> Yasyodvartayata\u1e25 prat\u012bpamuras\u0101 \u015batr\u016bnsamety\u0101gat\u0101n | <\/span><span data-path-to-node=\"93,0,6\"><span class=\"citation-6489\">Va\u1e45ge\u1e63v\u0101havavartinobhilikhit\u0101 kha\u1e0dgena k\u012brtirbhuje || Inscriptions on the Pillar (Chandra Gupta II eulogy) <\/span><\/span><span data-path-to-node=\"93,0,9\"><b data-path-to-node=\"93,0,9\" data-index-in-node=\"0\"><span class=\"citation-6488\">\u0905\u0930\u094d\u0925:<\/span><\/b><span class=\"citation-6488\"> &#8220;He, on whose arm fame was inscribed by the sword, when, in battle in the Vanga countries (Bengal), he kneaded (and turned back) with (his) breast the enemies who, uniting together, came against (him)&#8230;&#8221; <\/span><\/span><\/p>\n<div class=\"source-inline-chip-container ng-star-inserted\"><\/div>\n<\/blockquote>\n<p id=\"p-rc_a25bdef117aa897d-1510\" data-path-to-node=\"94\"><span data-path-to-node=\"94,0\"><b data-path-to-node=\"94,0\" data-index-in-node=\"0\">\u0938\u0902\u092c\u0902\u0927\u093f\u0924 \u0928\u0935\u093e\u091a\u093e\u0930<\/b> <\/span><span data-path-to-node=\"94,2\"><span class=\"citation-6487\">The Iron Pillar of Delhi was built using forge welding, which involved hammering heated iron lumps into a single mass<\/span><\/span><span data-path-to-node=\"94,4\">. <\/span><span data-path-to-node=\"94,6\"><span class=\"citation-6486\">Smiths kept phosphorous to produce a protective passivation layer on the metal&#8217;s surface, which prevents it from rusting<\/span><\/span><span data-path-to-node=\"94,8\">.<\/span><\/p>\n<p id=\"p-rc_a25bdef117aa897d-1511\" data-path-to-node=\"95\"><span data-path-to-node=\"95,0\"><b data-path-to-node=\"95,0\" data-index-in-node=\"0\">\u092e\u091c\u0947\u0926\u093e\u0930 \u0924\u0925\u094d\u092f<\/b> <\/span><span data-path-to-node=\"95,2\"><span class=\"citation-6485\">People believed that if you wrapped your arms around the pillar backwards, you would have good luck<\/span><\/span><span data-path-to-node=\"95,4\">. <\/span><span data-path-to-node=\"95,6\"><span class=\"citation-6484\">But then a fence was erected to protect it from the oils on people&#8217;s skin<\/span><\/span><span data-path-to-node=\"95,8\">.<\/span><\/p>\n<p id=\"p-rc_a25bdef117aa897d-1512\" data-path-to-node=\"96\"><span data-path-to-node=\"96,0\"><b data-path-to-node=\"96,0\" data-index-in-node=\"0\">\u0906\u0927\u0941\u0928\u093f\u0915 \u0935\u093f\u0930\u093e\u0938\u0924<\/b> <\/span><span data-path-to-node=\"96,2\"><span class=\"citation-6483\">Corrosion science protects bridges and pipelines, saving the global economy billions of dollars each year<\/span><\/span><span data-path-to-node=\"96,4\">.<\/span><\/p>\n<\/div><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":3564,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[76],"tags":[275,276,274,220,266,277],"class_list":["post-3764","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-physics-and-chemistry","tag-corrosion-science","tag-gupta-empire","tag-iron-pillar","tag-material-science","tag-metallurgy","tag-passivation"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\r\n<title>Rust-Proof Iron (The Delhi Pillar) 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