Corrosion testing of steel - galvanized, 410 stainless, 430, 201 and 304
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- Опубликовано: 7 сен 2024
- INCREDIBLE! Most manufactuers use metal that goes rusty!!
In developing a new product, Premiala needed to determine the corrosion resistance capabilites of several different types of steel potentially to be used to ensure that, unlike most others, our product NEVER goes rusty!
We sourced samples of the following materials:
* hot-dip galvanized mild steel
* 410 grade stainless steel (13/0)
* 430 grade stainless steel (18/0)
* 201 grade stainless steel (18/4)
* 304 grade stainless steel (18/8 or 18/10)
After scratching a portion of each sample with sandpaper, the samples underwent the following tests:
* Outside overnight - dew / water spray test
* 10 hour potable water immersion test
* Dishwasher cycle including hot drying stage
* Salt-spray test
* Additional dishwasher cycle with hot drying stage
* Additional outside overnight dew test
While we normally use stainless steel for all our products, the majority of manufacturers of this product use hot-dip galvanized mild steel, so we wanted to pit this baseline against various types of stainless steel.
This test helped identify which materials would be unsuitable for our future product. This video shows the testing Premiala undertakes to ensure the products we make are the best they can be.
premiala.com
I'm developing a new product at the moment and this was a very helpful video. Thank you.
Thank You!
thanks!
Each steel strengths and weaknesses are well documented already. 410, also called martensitic, is one of the worst against corrosion. The best ones against corrosion are 434, 3CR12, 304, 304L, 2205 duplex, lean duplex, superduplex, 316, 321 and 904L 6Mo.
You're right this isn't new information, but unfortunately most other manufacturers seem to have missed the memo! We wanted to show some real-world examples of what happens when manufacturers choose price over quality, and the end-user benefits you get from spending a bit more on a Premiala product.
316 is the best. Aka marine grade
I live in the rust belt and I'm looking at repairing my frame with 304 stainless steel
I'm pretty sure that will prevent too many rusting issues but it's a very expensive way to do it!
304 ss if working in rain continuesly then when corrosion catch?
Not sure I get the question exactly, sorry. However I'm not a metallurgical expert so you might be best to try an expert on this sort of thing. This was just a test we undertook for our own research.
I don't think your first experiment is viable, because you sanded the Galv rod first and then contaminated the rest with the same sand paper..
Fair point Marc. We hadn't imagined the contamination issue; although I would think if stainless steel is going to rust because it's scratched and has some galvanizing left on it, it's not a product we'd want to work with.
Fare enuf with all due respect ofcorse just wanted to point out the flaw in testing cheers, all the best with your future research and product line. What you guys are doing is great. Thanks Marc
Marc cheers mate, all feedback always appreciated! Take care!
Nice video.
But it seems like the immersion test might be not valid, since all the wires are in the same cup. You may be seeing galvanic anode protection from one wire to the others.
See: Cathodic Protection
en.m.wikipedia.org/wiki/Cathodic_protection
That's possible iddoperel... however they're all largely the same material, unlike say zinc and mild steel for example, and I'm not sure if there's enough of a difference in the materials to create much of that. The results in that test mirrored those in the outside overnight dew test, so we'd be inclined to think the test is valid. Fair hypothesis though, and it's possible that particular one could have had some other things going on as you suggested.