{"id":515,"date":"2026-09-28T17:23:38","date_gmt":"2026-09-28T09:23:38","guid":{"rendered":"https:\/\/www.ypmfg.com\/2026\/09\/28\/cnc-parts-black-anodizing-101\/"},"modified":"2026-09-28T17:23:38","modified_gmt":"2026-09-28T09:23:38","slug":"cnc-parts-black-anodizing-101","status":"publish","type":"post","link":"https:\/\/www.ypmfg.com\/ko\/2026\/09\/28\/cnc-parts-black-anodizing-101\/","title":{"rendered":"CNC \ubd80\ud488: \ube14\ub799 \uc544\ub178\ub2e4\uc774\uc9d5 \uc785\ubb38"},"content":{"rendered":"<div style=\"margin: 0 auto;padding: 20px;font-family: -apple-system, BlinkMacSystemFont,\">\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><strong style=\"font-weight: 600;color: #b32050\">\uac04\ub2e8\ud55c \ub2f5\ubcc0:<\/strong><\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">Black anodizing is a post-machining surface treatment applied to CNC-machined aluminum parts. It grows a thin ceramic oxide layer, typically 10 to 40 micrometers thick, that resists corrosion, adds surface hardness, and delivers a uniform matte or gloss black appearance. Unlike paint or electroplating, the finish bonds into the base metal, so it will not chip or peel under normal service. For <strong style=\"font-weight: 600;color: #b32050\">CNC \ubd80\ud488 \uac00\uacf5<\/strong>, black anodizing remains one of the most requested <strong style=\"font-weight: 600;color: #b32050\">surface finishes<\/strong> in aerospace, electronics housings, and industrial equipment.<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">\ub9cc\uc57d \ub2e4\uc74c\uc744 \uc9c0\uc815\ud558\ub294 \uacbd\uc6b0 <strong style=\"font-weight: 600;color: #b32050\">black anodized<\/strong> parts on a <strong style=\"font-weight: 600;color: #b32050\">CNC-machined<\/strong> drawing, a few decisions carry real cost risk: alloy grade, anodizing class,film thickness, and how threaded or tight-tolerance features are handled. Getting any of these wrong can trigger a rework cycle that adds weeks and unexpected expense.<\/p>\n<h2 style=\"font-size: 20px;font-weight: 600;margin: 1.4em 0 0.5em;color: #b32050;line-height: 1.4\">What Black Anodizing Does to a Machined Part<\/h2>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">Black anodizing converts the outermost aluminum layer into aluminum oxide through an electrochemical bath. The result is a hard, porous ceramic coating that is sealed to lock in color and block moisture. For <strong style=\"font-weight: 600;color: #b32050\">aluminum CNC parts<\/strong>, this layer typically adds one to three micrometers of dimensional growth per anodized surface.<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">That small increase can close a tolerance stack-up on tight fits. A bore specified at 10.00 mm can shift to roughly 10.02 mm after anodizing, which may bind a mating shaft. The machined part must therefore be cut slightly undersized before the finish is applied.<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><strong style=\"font-weight: 600;color: #b32050\">Post-machining process<\/strong> planning should account for this growth from the first CAD revision. Threaded holes, snap fits, and close-tolerance bores all need compensation built into the drawing before the part hits the machine.<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">The table below compares black anodizing with other finishes buyers commonly specify:<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><img decoding=\"async\" src=\"https:\/\/www.ypmfg.com\/wp-content\/themes\/mb\/images_nengli\/tube-laser-cutting-machine-1-rosglusvrbvwkzez7cu6q30iu3t5rwqflo9azzfs9u-optimized.jpg\" alt=\"cnc parts machining black anodized_cnc parts machining black anodized_cnc parts machining black anodized\" style=\"width: 100%;max-width: 960px;height: auto;display: block;margin: 1.8em auto;border-radius: 0px\"><\/p>\n<table style=\"width: 100%;border-collapse: collapse;margin: 1.6em 0;border-radius: 10px 10px 0 0;overflow: hidden\">\n<tr>\n<th style=\"background: #9e1840;color: #fff;padding: 14px 16px;text-align: left;font-weight: 600;border: 1px solid #e0e0e0\">\uc644\ub8cc<\/th>\n<th style=\"background: #9e1840;color: #fff;padding: 14px 16px;text-align: left;font-weight: 600;border: 1px solid #e0e0e0\">Typical Thickness<\/th>\n<th style=\"background: #9e1840;color: #fff;padding: 14px 16px;text-align: left;font-weight: 600;border: 1px solid #e0e0e0\">Corrosion Resistance<\/th>\n<th style=\"background: #9e1840;color: #fff;padding: 14px 16px;text-align: left;font-weight: 600;border: 1px solid #e0e0e0\">Color Range<\/th>\n<th style=\"background: #9e1840;color: #fff;padding: 14px 16px;text-align: left;font-weight: 600;border: 1px solid #e0e0e0\">\uac00\uc7a5 \uc801\ud569\ud55c \ub300\uc0c1<\/th>\n<\/tr>\n<tr>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Black anodizing (Type II)<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">10\u201340 \u00b5m<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">\ud6cc\ub96d\ud569\ub2c8\ub2e4<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Matte \/ gloss black<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">High-wear, visible components<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Clear anodizing<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">8\u201325 \u00b5m<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">\uc88b\uc544\uc694<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Natural metal look<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Structural, low-cost parts<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Hard anodizing (Type III)<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">25\u201350 \u00b5m<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">\ub9e4\uc6b0 \ub192\uc74c<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Dark grey to black<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Abrasive environments, tooling<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Powder coat<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">60\u2013120 \u00b5m<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">\uc88b\uc544\uc694<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Any RAL \/ Pantone<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Aesthetic, non-conductive housings<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Passivation (stainless)<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">N\/A<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">\ubcf4\ud1b5<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">\uc2e4\ubc84<\/td>\n<td style=\"padding: 12px 16px;color: #222222;border: 1px solid #e0e0e0\">Stainless steel assemblies<\/td>\n<\/tr>\n<\/table>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">The table shows that black anodizing sits in the middle of the cost-to-performance range. Choose <strong style=\"font-weight: 600;color: #b32050\">hard anodizing<\/strong> when your part faces constant abrasive contact; standard <strong style=\"font-weight: 600;color: #b32050\">Type II anodizing<\/strong> covers most cosmetic and corrosion-protection needs without the extra processing step.<\/p>\n<h2 style=\"font-size: 20px;font-weight: 600;margin: 1.4em 0 0.5em;color: #b32050;line-height: 1.4\">Key Specifications to Confirm Before You Order<\/h2>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">Before releasing a <strong style=\"font-weight: 600;color: #b32050\">CNC \ubd80\ud488 \uac00\uacf5<\/strong> drawing for black anodizing, walk through this checklist with your finisher or manufacturer:<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><strong style=\"font-weight: 600;color: #b32050\">\ud569\uae08 \ub4f1\uae09<\/strong>: 6061-T6 and 7075-T6 anodize consistently. 5052 may show slight batch-to-batch color variation.<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><strong style=\"font-weight: 600;color: #b32050\">Anodizing class<\/strong>: Type II (standard) versus Type III (hard) use different current densities and rinse cycles.<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><strong style=\"font-weight: 600;color: #b32050\">Film thickness<\/strong>: State a minimum and target value, for example 20 \u00b5m minimum, 30 \u00b5m target.<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><strong style=\"font-weight: 600;color: #b32050\">Color reference<\/strong>: Provide a physical sample or cite a standard such as MIL-DTL-5541 or a Pantone-matched swatch.<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><img decoding=\"async\" src=\"https:\/\/www.ypmfg.com\/wp-content\/themes\/mb\/images_nengli\/wire-edm-application.webp\" alt=\"cnc parts machining black anodized_cnc parts machining black anodized_cnc parts machining black anodized\" style=\"width: 100%;max-width: 960px;height: auto;display: block;margin: 1.8em auto;border-radius: 0px\"><\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><strong style=\"font-weight: 600;color: #b32050\">Threaded and fitted features<\/strong>: Mark which holes are masked off and which need dimensional compensation.<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><strong style=\"font-weight: 600;color: #b32050\">Sealing method<\/strong>: Immersion seal at 90 \u00b0C is standard; vapor seal can shift dimensions by a fraction of a micron.<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><strong style=\"font-weight: 600;color: #b32050\">Anodizing specifications<\/strong> on the drawing should reference the governing standard, such as ASTM B1621 or AMS 2339, so the finisher has no room for interpretation.<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><strong style=\"font-weight: 600;color: #b32050\">YPMFG<\/strong> reviews incoming drawings for anodizing callouts and flags potential tolerance conflicts before machining begins. This step catches a bad fit or an unmasked thread before the part reaches the anodizing line, reducing the chance of a rejected batch.<\/p>\n<h2 style=\"font-size: 20px;font-weight: 600;margin: 1.4em 0 0.5em;color: #b32050;line-height: 1.4\">Common Questions About Black Anodized CNC Parts<\/h2>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><strong style=\"font-weight: 600;color: #b32050\">Will black anodizing change my part dimensions?<\/strong><\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">Yes. Expect roughly one to two micrometers of growth per anodized surface. Update critical fit dimensions in your CAD model before releasing the drawing for machining.<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><strong style=\"font-weight: 600;color: #b32050\">Can I anodize a mixed-material assembly in one shot?<\/strong><\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><strong>No. Black anodizing is an aluminum-only process. Steel, copper, or polymer sub-components must be disassembled and finished separately, then reassembled.<\/strong><\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><strong style=\"font-weight: 600;color: #b32050\">How long does a black anodized coating last in service?<\/strong><\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">A properly sealed Type II film on 6061 aluminum can last well over ten years in outdoor exposure. Severe alkaline or acidic environments will degrade the coating faster, so verify the operating chemistry for your application.<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\"><strong style=\"font-weight: 600;color: #b32050\">Is black anodizing the same as black oxide on steel?<\/strong><\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">No. Black oxide is a thin conversion coating applied to iron and steel. Anodizing grows a ceramic layer into the aluminum substrate. The two processes differ in chemistry, thickness, and long-term performance.<\/p>\n<h2 style=\"font-size: 20px;font-weight: 600;margin: 1.4em 0 0.5em;color: #b32050;line-height: 1.4\">Choosing the Right Finish for Your Next Part<\/h2>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">\uc624\ub978\ucabd <strong style=\"font-weight: 600;color: #b32050\">\ud45c\uba74 \ub9c8\uac10<\/strong> call depends on your part&#8217;s operating environment, functional tolerances, and appearance requirements. A short engineering review of the drawing can catch a tolerance conflict or an alloy mismatch before the first cut is made, saving a full rework cycle.<\/p>\n<p style=\"margin: 1.25em 0;line-height: 1.9;font-size: 16px;color: #222222;text-align: justify;letter-spacing: 0.02em\">You can send your <strong style=\"font-weight: 600;color: #b32050\">CNC-machined<\/strong> part drawings and anodizing requirements to <strong style=\"font-weight: 600;color: #b32050\">YPMFG<\/strong> for a specification review. The team will confirm alloy suitability, suggest tolerance compensation values, and outline any <strong style=\"font-weight: 600;color: #b32050\">custom CNC machining<\/strong> steps needed to hit your <strong style=\"font-weight: 600;color: #b32050\">finish tolerance<\/strong> on the first pass. No minimum order is required for the initial review.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Quick answer:Black anodizing is a post-machining surface treatment applied to CNC-<\/p>","protected":false},"author":1,"featured_media":516,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[44],"tags":[478,477,476,405,383],"class_list":["post-515","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminum-parts","tag-black-anodizing","tag-cnc-parts","tag-surface-finish","tag-tolerance-stack-up"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>CNC Parts: Black Anodizing 101<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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