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Constructe
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Is Chrome or Stainless Steel resistant to corosion by salt and/or acid?
Not necessarily. As Borek indicated there are environmental factors, such as pH, dissolved oxygen, cation species and concentration, temperature, and local fluid velocity (convection) involved.Constructe said:Is Chrome or Stainless Steel resistant to corosion by salt and/or acid?
All metals protect themselves by building an impermeable oxide at the metal/environment interface. In the case of SS, it's the layer of Cr2O3. Fe and Ni do not form much of a protective oxide. Ti and Zr do.Constructe said:Oh thanks for the feedback. Stainless steel sure is much cheaper than titanium to protect against salt water and mild acid. I guess platinum is also relatively resistant although not resistant to theivery... lol.
It is because of the surface oxidation coating protects further oxidation and wear right?
Chlorides attack the oxide layer on many metals, particularly SS, and particularly at the grain boundaries and inclusions. One remedy is to reduce impurities like S, or P, and increase Mo, as previously mentioned.Constructe said:Thanks for your chemical clarification of oxidation protective barriers for stainless steel. So am I correct in believing that if I expose stainess steel to other metals in a harsh environment it may chemically react with it and strip away the barrier and cause erosion until a new protective layer forms (provided the stainless steel is not just a thin coating)? I suppose if that is the case if I build something with it I need to looki for stainless steel ingots or weild joints together.
Constructe said:So am I correct in believing that if I expose stainess steel to other metals in a harsh environment it may chemically react with it and strip away the barrier and cause erosion until a new protective layer forms (provided the stainless steel is not just a thin coating)?
We think PF is important - so we find time.Constructe said:Thanks. I noticed you are both frequent posters and appreciate the info. How do you find the time?
I was a process chemist in a brand-new pulp mill, and after suffering corrosion damage in the drum of the first-stage bleaching equipment (using stainless steel) the company opted to replace the drum with a titanium alloy (over 1/4 M $ for the drum alone) only to see it destroyed even sooner than the SS drum was. We had to invest in a cathodic protection system with sacrificial probes in the solute to get decent life out of the drum, and invest in non-metallic filter media to cover the drum. Eventually, it all got sorted out so the losses were tolerable, but when you're dealing with chlorine (bleaching agent) being introduced to Kraft pulp (high in NaOH and other inorganics) things get dicey pretty quick.viperau said:Nice comment Turbo-1, to my knowledge no-one has done much research in the use of electrolisis and the use of sacrifical elements, cost of research and development is more than replacing the product.
I do know of 1 brewery that uses old ammonia cooled tanks, and the leaking ammonia vapour will create the stain in a matter of days and the only real long term solution is electrolisis.
I went to this brewery and turned their 2 brown stained tank into a shiny stainless
Chrome and stainless steel resistance are both types of materials used for their resistance to corrosion and high temperatures. The main difference between them is their composition. Chrome resistance is made of nickel-chrome alloy, while stainless steel resistance is made of iron-chromium-nickel alloy.
Stainless steel resistance is generally more resistant to corrosion compared to chrome resistance. This is because of its higher chromium content, which forms a protective layer on the surface of the material, preventing it from rusting.
No, chrome and stainless steel resistance are not interchangeable. They have different properties and are used for different purposes. Chrome resistance is commonly used in heating elements, while stainless steel resistance is used in a variety of applications, including kitchen appliances, medical equipment, and chemical processing.
One disadvantage of chrome and stainless steel resistance is their high cost compared to other types of resistance materials. They are also relatively heavy, making them less suitable for portable or lightweight applications.
To maintain the resistance of chrome and stainless steel materials, it is important to regularly clean them with mild soap and water. Avoid using harsh chemicals or abrasive materials that can damage the protective layer on the surface. Additionally, proper storage and handling can help prevent scratches and other forms of damage that may compromise their resistance properties.