Aqueous corrosion resistance; the key to better sleep for every marine engineer!
If you’re looking for an alloy with outstanding resistance to aqueous corrosion, the below six are some of the best alloys on the market.
All alloys listed have incredible resistance to various forms of aqueous corrosion, including acids such as Sulfuric, Hydrofluoric, Nitric, Hydrochloric, salts, and seawater.
- INCONEL® Alloy 22
Alloy 22, also known as Nickel alloy 22 or Hastelloy C-22, this high-grade alloy offers a wide variety of corrosion resistance. Its aqueous corrosion resistance is known as a top choice for resistance at higher temperatures. This alloy is used frequently for processing nuclear fuel and, thanks to its resistance to seawater, general marine industries.
This nickel-chromium alloy offers high strength and thermal strength, resistance to oxidation and resistance in a large range of temperatures. This INCONEL alloy is known for its versatility which makes it a great choice for within a number of industries. It is known for its incredible heat-resistance, up to 815°C cryogenic temperatures. Inconel 625 has proven indispensable within the aerospace and marine industries.
- INCONEL® Alloy 625LCF
This version of 625(LCF – Low Cycle Fatigue) is specifically designed with low cycle fatigue resistance at temperatures up to 649°C. Apart from the LCF benefits, this alloy holds properties similar to alloy 625 because of such a closely related chemical composition.
- INCONEL® Alloy 686
Used mostly in areas of extreme corrosion – classed as a “super alloy”, Inconel 686 provides function at high temperatures and stresses. With a content of 59% Nickel, 19-23% Chromium and up to 17% Molybdenum on average, it can handle up to 104700 psi (tensile strength.)
- INCONEL® Alloy G-3
Alloy G-3 is a nickel-chromium-iron alloy that has good weldability and resistances to intergranular corrosion. It is commonly used for dealing with phosphoric and sulfuric acids in particular. Another alloy developed by Special Metals Corporation, it has a low carbon content and high resistance to atmospheric and acid corrosion. It is machinable with use of high-speed tools at a continuous pace to avoid work-hardening.
- INCOLOY® Alloy 825
Alloy 825, (along with Inconel 625) is one of the most popular choices of alloy for resisting corrosive substances. Most Incoloy’s in the 800 series, such as 800, 800H and 800HT are known for their incredible heat resistance, especially in treatment plants, pipelines, and tubing. Incoloy 825 is just as impressive, giving fantastic overall resistances, with high strength and resistance against stress-cracking, pitting and intergranular corrosion.
We recommend 825 for customers requiring a material that lives up to the “super alloy” name, particularly within petrochemical, oil and gas, pollution and processing industries.
Waverley Brownall manufacture fittings, components and valves from INCONEL® and INCOLOY® Special Metals materials for engineers within the UK and around the world.