{"id":14720,"date":"2025-08-31T23:02:09","date_gmt":"2025-08-31T22:02:09","guid":{"rendered":"https:\/\/verzinkshop.nl\/chemical-blackening-in-5-steps\/"},"modified":"2025-12-09T01:10:15","modified_gmt":"2025-12-09T00:10:15","slug":"chemical-blackening-in-5-steps","status":"publish","type":"post","link":"https:\/\/verzinkshop.nl\/en\/chemical-blackening-in-5-steps\/","title":{"rendered":"Chemical blackening in 5 steps"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"14720\" class=\"elementor elementor-14720 elementor-13242\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-054d37e e-flex e-con-boxed e-con e-parent\" data-id=\"054d37e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7e1a195 elementor-widget elementor-widget-text-editor\" data-id=\"7e1a195\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>Black oxidation: short &amp; clear<\/h2><p>Chemically blackening metal in 5 steps.<\/p><p>By default, you work with five steps: cleaning (degreaser) \u2192 rinsing \u2192 blacks \u2192 rinsing \u2192 sealing.<br>Only with difficult steel do you add an activation + extra rinsing step (then it is 7 steps).<\/p><p>These 5 steps are based on bare, unrusted and unpainted metal. Is there rust, old paint or mill scale? First remove blacks.  <\/p><h2>5 standard steps<\/h2><h3>1. Cleaning (degreaser)<\/h3><p>Goal: all oil, coolant, grease and rust inhibitor gone. Residues disturb blackening (spots, poor coverage). <\/p><p>Use a water-based, alkaline degreaser and follow the steps in the manual.<\/p><p>After degreasing, drain briefly.<\/p><ul><li>A soda solution (sodium carbonate) in warm water.<\/li><li>Easy to obtain: St. Marc (soda cleaner), Dasty Degreaser. <\/li><\/ul><h3>2. Rinse<\/h3><p>Rinse very well cold \u2013 no residue from the degreaser should remain.<br>30\u201360 s in clean, running water (not under the tap). This prevents degreaser from running to the next step. <\/p><h3>3. Blacks<\/h3><p>Dip for 2\u20134 min at room temperature in <a href=\"\/zwart-oxide-concentraat\/\">Electrolyte Black Oxide<\/a> or <a href=\"\/zwart-oxide-ultra-concentraat\/\">Black Oxide Ultra<\/a>. For stainless steel you use: Verzinkshop <a href=\"\/zwart-rvs-oxide-concentraat\/\"> Black Stainless Steel Oxide<\/a>.<br>Guideline concentration: 10\u201315% in water (read the manual for the correct mixing ratio).<br>Move parts lightly or stir the bath gently so that the parts come into contact with fresh liquid for an even result. <\/p><h3>4. Rinse (cold)<\/h3><p>Again 30\u201360 s in clean, running water to remove residues from the black bath.<\/p><h3>5. Sealing \/ preservation<\/h3><p>Immediately after rinsing, dip in a sealer for a few minutes. The black layer is porous and sucks up the sealer. This provides more rust protection and affects the appearance of the black.  <\/p><ul><li><a href=\"\/deepseal-metaal-sealer\/\">Verzinkshop DeepSeal<\/a> (oil-based): water displacement; Suitable for indoor and outdoor use.<\/li><li><a href=\"\/acryl-metaal-sealer\/\">Verzinkshop Acrylic Sealer<\/a> (water-based): very thin, without structure.<\/li><\/ul><p>&nbsp;<\/p><p>The final depth of the black can continue to develop for several hours while the sealer absorbs.<\/p><h2>7 steps in &#8220;hard-to-blacken&#8221; steel<\/h2><p>Some types of steel are difficult to blacken. Then add an activation after step 2, followed by an extra flush. Then you continue with blacks (step 3).  <br>Metals that can be difficult to blacken: chrome steel (chromium-molybdenum), tool steel, bearing steel (chrome steel), spring steel (high-carbon), gray cast iron, hot-rolled steel with mill scale, laser\/plasma-cut steel.<\/p><h3>6) Activation<\/h3><p>Makes the surface &#8220;fresh&#8221; and reactive again.<\/p><p><a href=\"https:\/\/verzinkshop.nl\/en\/metaal-activator\/\">Use Verzinkshop Metal Activator<\/a> at room temperature, then rinse well.<\/p><p>Practical alternatives:<\/p><ul><li>Phosphoric acid solution: 5\u201310% v\/v phosphoric acid in water, dip at room temperature for 1\u20132 minutes, then rinse thoroughly. (Wear PPE.) <\/li><li>Deruster: dip briefly, then rinse well.<\/li><li>Citric acid solution: for light oxide\/film, short dipping, rinse well.<\/li><\/ul><p>&nbsp;<\/p><p>For hazardous substances, always use PPE (gloves, goggles, etc.), ventilation and test on a test piece first.<\/p><h3>7) Rinsing (cold)<\/h3><p>After the activator, rinse thoroughly and then proceed to steps 3\u20135 (rinse blacks \u2192 \u2192 seal).<\/p><h2>Practical tips<\/h2><ul><li><b>Clean operation<\/b>: keep racks\/baskets clean and drain parts briefly between steps. Then spray them over the bath you just used with a plant sprayer, so that most of it runs back into your own container and you take less with you to the next step. <\/li><li><b>Water quality<\/b>: change rinse water in time.<\/li><li><b>Movement<\/b>: light movement during step 3 prevents stains.<\/li><li><b>Recovery is easy<\/b>: damage can be re-blackened and sealed locally \u2014 without visible transition (unlike paint).<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Chemically blackening metal in 5 steps.<\/p>\n<p>By default, you work with five steps: cleaning (degreaser) \u2192 rinsing \u2192 blacks \u2192 rinsing \u2192 sealing.<br \/>\nOnly with difficult steel do you add an activation + extra rinsing step (then it is 7 steps).<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[950],"tags":[942],"class_list":["post-14720","post","type-post","status-publish","format-standard","hentry","category-steel-and-iron-chemical-blackening","tag-chemical-blackening"],"acf":[],"_links":{"self":[{"href":"https:\/\/verzinkshop.nl\/en\/wp-json\/wp\/v2\/posts\/14720","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/verzinkshop.nl\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/verzinkshop.nl\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/verzinkshop.nl\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/verzinkshop.nl\/en\/wp-json\/wp\/v2\/comments?post=14720"}],"version-history":[{"count":0,"href":"https:\/\/verzinkshop.nl\/en\/wp-json\/wp\/v2\/posts\/14720\/revisions"}],"wp:attachment":[{"href":"https:\/\/verzinkshop.nl\/en\/wp-json\/wp\/v2\/media?parent=14720"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/verzinkshop.nl\/en\/wp-json\/wp\/v2\/categories?post=14720"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/verzinkshop.nl\/en\/wp-json\/wp\/v2\/tags?post=14720"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}