{"id":3503,"date":"2026-10-08T21:09:58","date_gmt":"2026-10-08T13:09:58","guid":{"rendered":"http:\/\/www.xechuyendunggiare.com\/blog\/?p=3503"},"modified":"2026-10-08T21:09:58","modified_gmt":"2026-10-08T13:09:58","slug":"what-are-the-requirements-for-the-corrosion-resistance-of-stamped-parts-47bc-6565eb","status":"publish","type":"post","link":"http:\/\/www.xechuyendunggiare.com\/blog\/2026\/10\/08\/what-are-the-requirements-for-the-corrosion-resistance-of-stamped-parts-47bc-6565eb\/","title":{"rendered":"What are the requirements for the corrosion resistance of stamped parts?"},"content":{"rendered":"

When a stamped part leaves our shop floor, it\u2019s not just a piece of pressed metal\u2014it\u2019s a promise. For 12 years, I\u2019ve stood next to our press brakes as we bend and stamp everything from small automotive brackets to large agricultural housing components, and the question I hear most from our customers\u2014OEMs, repair shops, and industrial equipment builders alike\u2014isn\u2019t just \u201ccan you stamp this to spec?\u201d It\u2019s \u201cwill this part hold up when it\u2019s exposed to whatever environment it\u2019s going to see?\u201d Corrosion resistance isn\u2019t a one-size-fits-all checkbox; it\u2019s a set of requirements we tailor to how the part will be used, because skimping here doesn\u2019t just lead to a failed part\u2014it leads to a missed deadline, a replacement cost, and a lot of frustrated customers. Stamped Parts<\/a><\/p>\n

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Let\u2019s start with the most basic requirement, because it\u2019s non-negotiable no matter the application: base material compatibility. Stamping starts with a blank sheet of metal, and not all metals react the same way to corrosion. If we\u2019re stamping a bracket for a food processing line where it\u2019ll be exposed to water, cleaning chemicals, and food residue, we\u2019re not using carbon steel. Carbon steel is cheap, easy to stamp, and strong, but it rusts through in months when exposed to moisture and salt. Instead, we use 304 stainless steel, which contains chromium that forms a passive oxide layer when it\u2019s exposed to oxygen\u2014think of it as a built-in shield that repairs itself if it\u2019s scratched. For parts that need even more resistance, like those used in coastal areas where salt air is rampant, we\u2019ll move to 316 stainless, which adds molybdenum to fend off chloride corrosion, the same stuff that eats away at bridge steel and car undercarriages. I learned this lesson early on, back in 2012 when a customer shipped us a batch of carbon steel brackets for a coastal construction project and they rusted before we even finished stamping them. We didn\u2019t just have to re-stamp the parts at no cost\u2014we learned that testing the base material\u2019s inherent corrosion resistance before we even set up a press is the first, and most critical, step.<\/p>\n

Next up, and this is where a lot of new stamping suppliers drop the ball: the stamping process itself can compromise corrosion resistance, so we have to account for that. When we stamp metal, we apply high pressure to bend and shape it, which can cause something called work hardening. Work-hardened metal is stronger, but it\u2019s also more prone to localized corrosion, especially at bends, sharp edges, and areas where we\u2019ve made deep draws or intricate cuts. I\u2019ve seen parts that passed a salt spray test before stamping, only to fail 48 hours later because the bending process left micro-cracks in the metal\u2019s surface, giving corrosion a place to start. That\u2019s why at our shop, we adjust our stamping parameters based on the material: for stainless steel parts, we use slower press speeds and lower tonnage on complex bends to reduce work hardening. For steel parts that we\u2019ll be coating later, we make sure to leave a uniform surface finish so the coating can adhere evenly\u2014no sharp, burr-edged edges, because a burr is a tiny weak point that will corrode first. We also pay close attention to lubrication during stamping. The right lubricant reduces friction, minimizes work hardening, and keeps the metal\u2019s surface intact\u2014using a cheap, harsh lubricant can leave residue that traps moisture and accelerates corrosion after the part is in use.<\/p>\n

Then there\u2019s the corrosion protection layer, and this is where we have to align with the part\u2019s end environment. Not all coatings are created equal, and picking the wrong one is a waste of money and a liability. Let\u2019s break down the common coatings we offer, and when we recommend each. Hot-dip galvanizing is the go-to for outdoor structural parts, like fence posts or truck frames. It works by dipping the stamped part in molten zinc, which forms a layer that not only protects the steel underneath but also acts as a sacrificial anode\u2014if the zinc layer gets scratched, it corrodes first, saving the steel. But hot-dip galvanizing has a catch: it can add thickness to the part, so if the part has tight tolerances, it\u2019s not the right choice. For those, we use electro-galvanizing, which is a thinner, more precise zinc coating applied through an electric current\u2014great for automotive parts that fit into tight gaps, but not as durable for heavy outdoor use. For parts that will be exposed to harsh chemicals, like those in the chemical processing industry, we use powder coating. Powder coating is a dry paint applied electrostatically, then cured in an oven to form a hard, seamless layer that resists chipping and chemical exposure. We recently did a batch of valve housings for a water treatment plant, and we tested the powder coating against chlorine and pH variations before we delivered it\u2014they\u2019ve been in use for three years now with zero rust, which is a win. We also work with uncoated parts sometimes, like when a customer wants a bare stainless steel part for a high-heat application, like an engine exhaust component. In those cases, we have to make sure the stainless steel grade matches the temperature and environment\u2014304 is fine for mild high heat, but 321 stainless, which has titanium added to prevent grain boundary corrosion at high temperatures, is a must for exhaust systems that see regular heat cycles.<\/p>\n

Another requirement that\u2019s often overlooked is the part\u2019s design itself. A stamped part might be perfect on paper, but if the design traps water, dirt, or chemicals, it will corrode no matter what material or coating you use. That\u2019s why our design team works closely with customers early in the process to adjust for corrosion. For example, we always design stamped parts with drainage holes\u2014even a small 1\/8 inch hole at the lowest point of a bracket keeps water from pooling and sitting against the metal. We avoid sharp corners and deep crevices where coating can\u2019t reach, because a thin spot in the coating is a failure waiting to happen. We also make sure that mating surfaces (where two parts bolt or clamp together) have clearance so that they don\u2019t rub against each other and wear through the coating. I remember a customer came to us a few years ago with a design for a trailer hitch bracket that had no drainage holes and tight mating surfaces. We worked with them to add two small holes and widen the mating gap, and the trailer hitches they\u2019re now producing have a 10-year rust warranty, compared to the industry standard of 5 years. Good design isn\u2019t just about fit and function\u2014it\u2019s about corrosion resistance, and it starts at the stamping table, not after the part is finished.<\/p>\n

Testing is the final, non-negotiable requirement. We can recommend a material, adjust the stamping process, pick a coating, and tweak the design, but we have to prove that the part will hold up. The tests vary based on the application: salt spray testing (ASTM B117) is the standard for parts exposed to salt air or road salt, where we spray the part with a 5% salt solution for hundreds of hours and check for rust. We recently stamped a batch of truck frame cross members for a customer in Minnesota, where road salt is used heavily in winter, and we ran a 1,000-hour salt spray test on them\u2014they came out with zero red rust, which is exactly what the customer needed. For parts exposed to high temperatures, we do heat cycle testing, where we heat the part to its operating temperature, cool it, and repeat thousands of times to make sure the coating doesn\u2019t crack or peel. For parts that go into food processing, we test for resistance to food acids and cleaning chemicals, following FDA standards to make sure no toxic materials leach out if the coating fails. We keep detailed records of every test we run, because a customer might come back in five years asking for parts with the same corrosion resistance, and we need to show them that we delivered on that promise.<\/p>\n

At the end of the day, corrosion resistance for stamped parts is about attention to detail at every step of the process. It\u2019s not a spec we check off at the end of production\u2014it\u2019s part of the conversation from the first time a customer sends us a CAD file. We\u2019ve seen too many suppliers cut corners on material, process, or testing to save a few bucks, and the parts end up failing in the field, costing everyone time and money. As a stamped parts supplier, our job isn\u2019t just to press metal into shape\u2014it\u2019s to make sure that metal lasts as long as the customer needs it to, no matter where or how they use it.<\/p>\n

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If you\u2019re working on a project that needs stamped parts with reliable corrosion resistance, whether it\u2019s for automotive, agricultural, industrial, or construction use, let\u2019s talk. We\u2019ll walk through your application, help you pick the right material, adjust the design if needed, and run the necessary tests to make sure your parts hold up for years to come. Don\u2019t leave corrosion to chance\u2014work with a supplier that understands that every stamped part is a promise, and we take that promise seriously.<\/p>\n

Sheet Metal Parts<\/a> References
\nASM International. (2020). Corrosion: Understanding the Basics. ASM Handbook, Volume 13A.
\nASTM International. (2021). Standard Practice for Operating Salt Spray (Fog) Apparatus (ASTM B117).
\nBrand, R. (2018). Stamping Process Effects on Corrosion Resistance of Metal Components. Journal of Materials Processing Technology.
\nFood and Drug Administration. (2019). Food Contact Materials: Coatings and Surface Treatments.<\/p>\n

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Hebei Kailu Hardware Manufacturing Co., Ltd.<\/a>
We’re well-known as one of the leading stamped parts manufacturers and suppliers in China, also support customized service. Welcome to buy high quality stamped parts made in China here and get free sample from our factory. For price consultation, contact us.
Address: Yaojiubo Village, Nanpi Town, Nanpi County, Cangzhou City, Hebei Province
E-mail: 714184486@qq.com
WebSite: https:\/\/www.weldedpart.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

When a stamped part leaves our shop floor, it\u2019s not just a piece of pressed metal\u2014it\u2019s … What are the requirements for the corrosion resistance of stamped parts?<\/span>Read more<\/a><\/p>\n","protected":false},"author":747,"featured_media":3503,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3466],"class_list":["post-3503","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-stamped-parts-4003-65a14a"],"_links":{"self":[{"href":"http:\/\/www.xechuyendunggiare.com\/blog\/wp-json\/wp\/v2\/posts\/3503","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.xechuyendunggiare.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.xechuyendunggiare.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.xechuyendunggiare.com\/blog\/wp-json\/wp\/v2\/users\/747"}],"replies":[{"embeddable":true,"href":"http:\/\/www.xechuyendunggiare.com\/blog\/wp-json\/wp\/v2\/comments?post=3503"}],"version-history":[{"count":0,"href":"http:\/\/www.xechuyendunggiare.com\/blog\/wp-json\/wp\/v2\/posts\/3503\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.xechuyendunggiare.com\/blog\/wp-json\/wp\/v2\/posts\/3503"}],"wp:attachment":[{"href":"http:\/\/www.xechuyendunggiare.com\/blog\/wp-json\/wp\/v2\/media?parent=3503"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.xechuyendunggiare.com\/blog\/wp-json\/wp\/v2\/categories?post=3503"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.xechuyendunggiare.com\/blog\/wp-json\/wp\/v2\/tags?post=3503"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}