A team headed by Professor Mingxin Huang from the University of Hong Kong's Department of Mechanical Engineering has achieved a significant advancement in the field of stainless steel. This recent innovation focuses on the development of stainless steel designed for hydrogen applications, known as S
  • XeroxCool@lemmy.world
    44·
    10 months ago

    A process that normally lowers the corrosion resistance had the opposite effect when applied over an alternate known-good option. Chromium passivation is the known-good, manganese passivation is known to make it worse. Manganese-passivating chromium-passivated stainless looks like it’s way more corrosion resistant than either passivation on its own and non-passivated stainless

    Also, daily reminder, stainless steel corrodes. It forms a corrosion layer that is hard and doesn’t change size compared to the base metal (unlike rust on normal steel, which expands), but it can still be prone to erosion particularly in oxygen-depleted water. Even 316.

      • XeroxCool@lemmy.world
        3·
        10 months ago

        I’d say a major difference is that steel is an alloy of natural inorganic elements. The components aren’t especially toxic, at least not any more than how they already exist in the environment. Microplastics are entirely man made and don’t have any natural, decent way to be broken down organically. Would you count sand as a pollutant? It’ll last way longer than plastic and we certainly ship it around everywhere. Eating sand is just part of marine life

    • Langehund@lemmy.world
      40·
      11 months ago

      This steels intended design use is hydrogen production through the electrolysis of salt water. Typically it is done with titanium because existing stainless steels corrode too much in the high chloride environment. But this novel process of adding corrosion resistance steel performs just as well as the titanium. It’s not a knife steel. As with most material science materials, this was designed for a specific use case in mind. Not all steels have to be good at everything. A knife super steel would probably be bad at hydrogen production for example.

      • 𝕽𝖚𝖆𝖎𝖉𝖍𝖗𝖎𝖌𝖍@midwest.social
        8·
        11 months ago

        Thanks!

        True, steels are very specific, even within knife applications. For instance, there are certain steels used for knives for marine environments; they’re not usually used outside of those specialty knives because they give up other desireable characteristics for the corrosion resistance.

        Which leads me back to why I asked the question. Corrosion/rust resistance is desireable in knives, and that’s what this sounded like. Ah, well… maybe it’ll inform the next generation of steels.

    • webghost0101@sopuli.xyz
      2·
      10 months ago

      The way i read it is its another big step in the development of nanocomposites/meta materials.

      You can sort of explain it by hand carving materials on a molecular level so they exibit all kinds of possibly exitic effects. Like deforming light or to kill certain germs.

      Its one of my favorite tech to mention because the story of supposed normal looking but atomically weird materials found at ufo crashsites