{"id":2732,"date":"2026-03-04T09:16:06","date_gmt":"2026-03-04T08:16:06","guid":{"rendered":"https:\/\/www.nickelcasting.com\/?p=2732"},"modified":"2026-03-04T09:16:13","modified_gmt":"2026-03-04T08:16:13","slug":"monel-corrosion-resistance","status":"publish","type":"post","link":"https:\/\/www.nickelcasting.com\/ja\/monel-corrosion-resistance\/","title":{"rendered":"\u30e2\u30cd\u30eb\u306e\u8010\u98df\u6027\u306f\u306a\u305cHF\u9178\u3067\u512a\u308c\u3066\u3044\u308b\u306e\u304b\uff1f"},"content":{"rendered":"<p data-path-to-node=\"3\">\u5316\u5b66\u51e6\u7406\u3068\u6d77\u6d0b\u5de5\u5b66\u306e\u53b3\u3057\u3044\u74b0\u5883\u3067\u306f\u3001 \u6750\u6599\u304c\u7834\u640d\u3059\u308b\u3068\u3044\u3046\u9078\u629e\u80a2\u306f\u3081\u3063\u305f\u306b\u306a\u3044\u3002\u30aa\u30fc\u30b9\u30c6\u30ca\u30a4\u30c8\u7cfb\u30b9\u30c6\u30f3\u30ec \u30b9\u92fc\u306f\u5e45\u5e83\u3044\u7528\u9014\u306b\u4f7f\u7528\u3055\u308c\u308b\u304c\u3001\u975e\u9178\u5316\u6027 \u9178\u3084\u9ad8\u901f\u6d77\u6c34\u3067\u306f\u3057\u3070\u3057\u3070\u9650\u754c\u306b\u9054\u3059\u308b\u3002\u305d\u3053\u3067 <b data-path-to-node=\"3\" data-index-in-node=\"281\">\u30e2\u30cd\u30eb\u306e\u8010\u98df\u6027<\/b> \u304c\u6280\u8853\u4ed5\u69d8\u306e\u6c7a\u3081\u624b\u3068\u306a\u308a\u307e\u3059\u3002\u30cb\u30c3\u30b1\u30eb\u3068\u9285\u306e\u56fa\u6eb6\u4f53\u5408\u91d1\u3067\u3042\u308b\u30e2\u30cd\u30eb\uff08\u7279\u306bAlloy 400\u3068K-500\uff09\u306f\u3001\u30af\u30ed\u30e0\u57fa\u5408\u91d1\u304c\u6025\u901f\u306a\u8131\u7070\u306b\u60a9\u307e\u3055\u308c\u308b\u3088\u3046\u306a\u74b0\u5883\u3067\u3082\u9ad8\u8cb4\u3055\u3092\u4fdd\u3064\u30e6\u30cb\u30fc\u30af\u306a\u96fb\u6c17\u5316\u5b66\u7684\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002.<\/p>\n<p data-path-to-node=\"3\"><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-2733\" src=\"http:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/03\/149.jpg\" alt=\"\u30e2\u30cd\u30eb\u306e\u8010\u98df\u6027\u306f\u306a\u305cHF\u9178\u6027\u3067\u512a\u308c\u3066\u3044\u308b\u306e\u304b\uff1f\" width=\"1024\" height=\"765\" srcset=\"https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/03\/149.jpg 1024w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/03\/149-300x224.jpg 300w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/03\/149-768x574.jpg 768w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/03\/149-16x12.jpg 16w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<h3 data-path-to-node=\"4\">\u30cb\u30c3\u30b1\u30eb\u3068\u9285\u306e\u96fb\u6c17\u5316\u5b66\u7684\u76f8\u4e57\u52b9\u679c<\/h3>\n<p data-path-to-node=\"5\">\u305d\u306e\u6839\u672c\u7684\u306a\u7406\u7531\u306f <b data-path-to-node=\"5\" data-index-in-node=\"43\">\u30e2\u30cd\u30eb\u306e\u8010\u98df\u6027<\/b> lies in its binary composition. By alloying approximately 63% nickel with 28-34% copper, the material benefits from the noble characteristics of both elements. Unlike stainless steels, which rely on a fragile chromium-oxide &#8220;passive&#8221; layer that can be stripped away by chlorides or reducing agents, Monel is inherently resistant to many non-oxidizing conditions.<\/p>\n<p data-path-to-node=\"6\">\u30d5\u30c3\u5316\u6c34\u7d20\u9178(HF)\u30a2\u30eb\u30ad\u30eb\u5316\u88c5\u7f6e\u3067\u306f\u3001\u7cbe\u88fd\u3067\u6700\u3082\u904e\u9177\u306a\u74b0\u5883\u306e\u3072\u3068\u3064\u3067\u3042\u308bMonel 400\u304c\u696d\u754c\u6a19\u6e96\u3067\u3059\u3002\u9178\u304c\u9ad8\u6fc3\u5ea6\u306b\u66dd\u6c17\u3055\u308c\u3066\u3044\u306a\u3051\u308c\u3070\u3001\u6cb8\u70b9\u307e\u3067\u306e\u3059\u3079\u3066\u306e\u6fc3\u5ea6\u306b\u304a\u3044\u3066\u4f4e\u3044\u8150\u98df\u901f\u5ea6\u3092\u7dad\u6301\u3057\u307e\u3059\u3002.<\/p>\n<hr data-path-to-node=\"7\" \/>\n<h3 data-path-to-node=\"8\">\u6bd4\u8f03\u6027\u80fd\uff1a\u30e2\u30cd\u30eb400\u3068\u4e00\u822c\u5408\u91d1\u306e\u6bd4\u8f03<\/h3>\n<p data-path-to-node=\"9\">\u6b21\u306e\u8868\u306f\u3001\u7279\u5b9a\u306e\u8150\u98df\u6027\u5a92\u4f53\u306b\u304a\u3051\u308b\u4ed6\u306e\u5de5\u696d\u7528\u5408\u91d1\u3068\u6bd4\u8f03\u3057\u305f\u30e2\u30cd\u30eb\u306e\u6027\u80fd\u6307\u6a19\u3092\u5f37\u8abf\u3057\u305f\u3082\u306e\u3067\u3059\u3002.<\/p>\n<table data-path-to-node=\"10\">\n<thead>\n<tr>\n<td><strong>\u74b0\u5883<\/strong><\/td>\n<td><strong><a href=\"https:\/\/www.nickelcasting.com\/ko\/%eb%8b%88%ec%bc%88-%ed%95%a9%ea%b8%88\/%eb%aa%a8%eb%84%ac-%ea%b8%88%ec%86%8d-%ed%95%a9%ea%b8%88\/%eb%aa%a8%eb%84%ac-400\/\">\u30e2\u30cd\u30eb400<\/a><\/strong><\/td>\n<td><strong>316L\u30b9\u30c6\u30f3\u30ec\u30b9<\/strong><\/td>\n<td><strong>C276\u30cf\u30b9\u30c6\u30ed\u30a4<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><span data-path-to-node=\"10,1,0,0\"><b data-path-to-node=\"10,1,0,0\" data-index-in-node=\"0\">\u6cb8\u9a30 70% HF \u9178<\/b><\/span><\/td>\n<td><span data-path-to-node=\"10,1,1,0\">\u7d20\u6674\u3089\u3057\u3044<\/span><\/td>\n<td><span data-path-to-node=\"10,1,2,0\">\u6025\u901f\u306a\u6545\u969c<\/span><\/td>\n<td><span data-path-to-node=\"10,1,3,0\">\u30b0\u30c3\u30c9<\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"10,2,0,0\"><b data-path-to-node=\"10,2,0,0\" data-index-in-node=\"0\">\u6dc0\u3093\u3060\u6d77\u6c34<\/b><\/span><\/td>\n<td><span data-path-to-node=\"10,2,1,0\">\u5b54\u98df\u306e\u5bfe\u8c61<\/span><\/td>\n<td><span data-path-to-node=\"10,2,2,0\">\u4e2d\u7a0b\u5ea6\u306e\u30d4\u30c3\u30c6\u30a3\u30f3\u30b0<\/span><\/td>\n<td><span data-path-to-node=\"10,2,3,0\">\u30b9\u30fc\u30da\u30ea\u30a2<\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"10,3,0,0\"><b data-path-to-node=\"10,3,0,0\" data-index-in-node=\"0\">\u6d41\u308c\u308b\u6d77\u6c34 (&gt;3m\/s)<\/b><\/span><\/td>\n<td><span data-path-to-node=\"10,3,1,0\">\u4f8b\u5916\u7684<\/span><\/td>\n<td><span data-path-to-node=\"10,3,2,0\">\u6d78\u98df\/\u8150\u98df<\/span><\/td>\n<td><span data-path-to-node=\"10,3,3,0\">\u4f8b\u5916\u7684<\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"10,4,0,0\"><b data-path-to-node=\"10,4,0,0\" data-index-in-node=\"0\">\u9084\u5143\u786b\u9178<\/b><\/span><\/td>\n<td><span data-path-to-node=\"10,4,1,0\">\u826f\u597d\uff0880%\u307e\u3067\uff09<\/span><\/td>\n<td><span data-path-to-node=\"10,4,2,0\">\u8ca7\u3057\u3044<\/span><\/td>\n<td><span data-path-to-node=\"10,4,3,0\">\u7d20\u6674\u3089\u3057\u3044<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr data-path-to-node=\"11\" \/>\n<h3 data-path-to-node=\"12\">\u5fdc\u529b\u8150\u98df\u5272\u308c\uff08SCC\uff09\u306e\u6291\u5236<\/h3>\n<p data-path-to-node=\"13\">\u30e2\u30cd\u30eb\u30b7\u30ea\u30fc\u30ba\u306e\u6700\u3082\u91cd\u8981\u306a\u5229\u70b9\u306e\u3072\u3068\u3064\u306f\u3001 \u5869\u5316\u7269\u30a4\u30aa\u30f3\u306b\u3088\u308b\u5fdc\u529b\u8150\u98df\u5272\u308c(SCC)\u306b\u5bfe\u3059 \u308b\u4e8b\u5b9f\u4e0a\u306e\u8010\u6027\u3067\u3042\u308b\u3002\u9ad8\u5727\u306e\u8239\u8236\u7528\u90e8\u54c1\u3067\u306f\u3001300\u7cfb\u30b9\u30c6\u30f3\u30ec\u30b9\u92fc\u306f\u3001\u5869\u5316\u7269\u306e\u5b58\u5728\u4e0b\u3067\u4f1d\u64ad\u3059\u308b\u5fae\u5c0f\u4e80\u88c2\u306b\u3088\u308a\u3001\u3057\u3070\u3057\u3070\u58ca\u6ec5\u7684\u306a\u7834\u640d\u3092\u8d77\u3053\u3059\u3002.<\/p>\n<p data-path-to-node=\"14\"><b data-path-to-node=\"14\" data-index-in-node=\"0\">\u30e2\u30cd\u30eb K-500<\/b>, \u6790\u51fa\u786c\u5316\u306e\u305f\u3081\u306b\u30a2\u30eb\u30df\u30cb\u30a6\u30e0\u3068\u30c1\u30bf\u30f3\u3092\u52a0\u3048\u308b\u3053\u3068\u3067\u3001\u9ad8\u3044\u786c\u5ea6\u3092\u7dad\u6301\u3057\u3066\u3044\u308b\u3002 <b data-path-to-node=\"14\" data-index-in-node=\"94\">\u30e2\u30cd\u30eb\u306e\u8010\u98df\u6027<\/b> \u964d\u4f0f\u5f37\u5ea6(<span class=\"math-inline\" data-math=\"\\sigma_y\" data-index-in-node=\"172\">$<\/span>) comparable to many alloy steels. However, engineers must be cautious of hydrogen embrittlement in K-500 when used in &#8220;sour&#8221; (<span class=\"math-inline\" data-math=\"H_2S\" data-index-in-node=\"307\">$H_2S$<\/span>)\u74b0\u5883\u4e0b\u3067\u306e\u9ad8\u5f35\u529b\u8ca0\u8377\u3002.<\/p>\n<p data-path-to-node=\"14\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-2734\" src=\"http:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/03\/150.jpg\" alt=\"\u30e2\u30cd\u30eb\u306e\u8010\u98df\u6027\u306f\u306a\u305cHF\u9178\u6027\u3067\u512a\u308c\u3066\u3044\u308b\u306e\u304b\uff1f\" width=\"1024\" height=\"765\" srcset=\"https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/03\/150.jpg 1024w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/03\/150-300x224.jpg 300w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/03\/150-768x574.jpg 768w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/03\/150-16x12.jpg 16w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<h3 data-path-to-node=\"15\">\u8236\u7528\u91d1\u5177\u306e\u30ad\u30e3\u30d3\u30c6\u30fc\u30b7\u30e7\u30f3\u3068\u8010\u98df\u6027<\/h3>\n<p data-path-to-node=\"16\">In the maritime sector, corrosion is often compounded by mechanical wear. Pump impellers and propeller shafts face high-velocity flow that causes &#8220;cavitation erosion.&#8221; The copper content in Monel provides a natural bio-fouling resistance, preventing the attachment of marine organisms that lead to localized crevice corrosion. Furthermore, its high ductility ensures that the material absorbs energy from collapsing cavitation bubbles without the surface pitting typical of more brittle metals.<\/p>\n<hr data-path-to-node=\"17\" \/>\n<h3 data-path-to-node=\"18\">\u95a2\u9023Q&amp;A<\/h3>\n<p data-path-to-node=\"19\"><b data-path-to-node=\"19\" data-index-in-node=\"0\">Q1: \u9178\u6027\u74b0\u5883\u306b\u304a\u3051\u308b\u30e2\u30cd\u30eb400\u306e\u8150\u98df\u901f\u5ea6\u306b\u66dd\u6c17\u306f\u3069\u306e\u3088\u3046\u306b\u5f71\u97ff\u3057\u307e\u3059\u304b\uff1f<\/b><\/p>\n<p data-path-to-node=\"19\">A1: Monel is a &#8220;reducing-environment&#8221; alloy. In acids like Hydrofluoric or Sulfuric, the presence of dissolved oxygen (aeration) significantly increases the corrosion rate. Oxygen acts as a depolarizer, facilitating the cathodic reaction and stripping the protective film. For high-aeration scenarios, a more highly alloyed material like Hastelloy C276 may be required.<\/p>\n<p data-path-to-node=\"20\"><b data-path-to-node=\"20\" data-index-in-node=\"0\">Q2: \u30e2\u30cd\u30ebK-500\u306f\u30b5\u30ef\u30fc\u30ac\u30b9(<span class=\"math-inline\" data-math=\"H_2S\" data-index-in-node=\"41\">$H_2S$<\/span>NACE\u898f\u683c\u306b\u6e96\u62e0\u3057\u305f\u30b5\u30fc\u30d3\u30b9\u304b\uff1f<\/b><\/p>\n<p data-path-to-node=\"20\">A2: \u53ef\u80fd\u3067\u3059\u304c\u3001\u5236\u9650\u304c\u3042\u308a\u307e\u3059\u3002K-500\u306f\u4e00\u822c\u7684\u306a\u8010\u98df\u6027\u306b\u306f\u512a\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u786c\u5ea6\u304c\u3042\u308b\u30ec\u30d9\u30eb\uff08\u901a\u5e3835HRC\uff09\u3092\u8d85\u3048\u308b\u5834\u5408\u3001\u307e\u305f\u306f\u6c34\u7d20\u3092\u767a\u751f\u3059\u308b\u4e9c\u925b\u30e1\u30c3\u30ad\/\u967d\u6975\u9178\u5316\u51e6\u7406\u3055\u308c\u305f\u92fc\u6750\u3068\u7d44\u307f\u5408\u308f\u305b\u305f\u5834\u5408\u3001\u6c34\u7d20\u8a98\u8d77\u5fdc\u529b\u5272\u308c\uff08HISC\uff09\u306e\u5f71\u97ff\u3092\u53d7\u3051\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002.<\/p>\n<p data-path-to-node=\"21\"><b data-path-to-node=\"21\" data-index-in-node=\"0\">Q3: \u306a\u305c\u30e2\u30cd\u30eb\u306f\u30c1\u30bf\u30f3\u3088\u308a\u3082\u7279\u5b9a\u306e\u6d77\u6c34\u914d\u7ba1\u30b7\u30b9\u30c6\u30e0\u306b\u597d\u307e\u308c\u308b\u306e\u3067\u3059\u304b\uff1f<\/b><\/p>\n<p data-path-to-node=\"21\">A3: \u30c1\u30bf\u30f3\u306f\u307b\u307c\u5b8c\u74a7\u306a\u8010\u98df\u6027\u3092\u63d0\u4f9b\u3057\u307e\u3059\u304c\u3001\u30e2\u30cd\u30eb\u306f\u305d\u306e\u512a\u308c\u305f\u71b1\u4f1d\u5c0e\u6027\u3068\u5929\u7136\u306e\u9632\u6c5a\u7279\u6027\u306b\u3088\u308a\u3001\u71b1\u4ea4\u63db\u5668\u3084\u914d\u7ba1\u306b\u597d\u307e\u308c\u308b\u3053\u3068\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u3002\u8868\u9762\u3067\u653e\u51fa\u3055\u308c\u308b\u9285\u30a4\u30aa\u30f3\u306f\u30d5\u30b8\u30c4\u30dc\u3084\u85fb\u985e\u306e\u6210\u9577\u3092\u6291\u5236\u3057\u3001\u5316\u5b66\u7684\u6bba\u751f\u7269\u5264\u306a\u3057\u3067\u9ad8\u3044\u6d41\u91cf\u52b9\u7387\u3092\u7dad\u6301\u3057\u307e\u3059\u3002.<\/p>","protected":false},"excerpt":{"rendered":"<p>In the demanding landscape of chemical processing and marine engineering, material failure is rarely an option. While austenitic stainless steels serve a broad range of applications, they frequently meet their limit in non-oxidizing acids and high-velocity seawater. This is where Monel corrosion resistance becomes the decisive factor for technical specification. As a nickel-copper solid-solution alloy, Monel (specifically Alloy 400 and K-500) offers a unique electrochemical profile that remains noble in environments where chromium-based alloys suffer from rapid depassivation. The Electrochemical Synergy of Nickel and Copper The fundamental reason behind the superior Monel corrosion resistance lies in its binary composition. By alloying approximately 63% nickel with 28-34% copper, the material benefits [&hellip;]<\/p>","protected":false},"author":1,"featured_media":2733,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[3],"tags":[],"class_list":["post-2732","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"spectra_custom_meta":{"_edit_lock":["1772612031:1"],"_edit_last":["1"],"rank_math_seo_score":["71"],"rank_math_description":["Critical marine and chemical systems fail when standard alloys succumb to HF acid or brine. 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