With over 30% of marine equipment failures being the result of marine corrosion, the subsequent costs have added up; now seawater corrosion costs are estimated at 4 % of the GNP. Unfortunately, sea water is not a simple medium because it\u00a0is chemically and biologically active, which can have an enormity of effects.<\/p>\n
The Good News: Protection Is Possible<\/strong><\/em> Materials for Seawater Rescue<\/strong><\/em> Monel –\u00a0Resistant in Rough Waves & Rapidly Flowing Seawater Though Monel is extremely resistant to seawater, be cautious when utilizing it alongside steel, iron, zinc and aluminum, as these metals (not Monel) will corrode because of the problem of electrolytic action in salt water (also known as Galvanic corrosion). Monel is a popular choice for applications such as off-shore platforms, as well as power and process plants which use seawater as a coolant.<\/p>\n Titanium \u2013 Ideal When Light Weight Is Needed Titanium is resistant to seawater up to as high as 500F (260C) and has been shown to last almost two decades in tests of polluted seawater. It has been used up to a mile in depth and has shown no signs of pitting or crevice corrosion, even after years of exposure. It has even been shown to resist the agitated effects of tides and currents. In terms of high velocity marine environments, titanium is practically completely resistant to any erosion even up to a velocity of 120 ft.\/sec.<\/p>\n AL-6XN \u2013 The Ultimate for Strength, Weldability & Formability With over 30% of marine equipment failures being the result of marine corrosion, the subsequent costs have added up; now seawater corrosion costs are estimated at 4 % of the…<\/p>\n","protected":false},"author":1,"featured_media":608,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"yoast_head":"\n
\nTo select the right material, you’ll first need to take into account the\u00a0strength, damage tolerance, reliability, safety and longevity you need for your project. In addition, you must also consider chloride concentration, temperature,\u00a0oxygen, and biology which can be challenging as these variables are ever\u00a0changing and can affect one another.<\/p>\n\n
\nThere are a vast enormity of materials which can assist in helping to prevent sea water corrosion, but in this paper we are going to focus on the three we feel are best suited to effectively and economically operate in marine environments.<\/p>\n
\nMonel is extraordinarily resistant to rapidly flowing seawater, with pitting and cracking typically only occurring in a marine environment if the saltwater is stagnant. This characteristic, combined with its ability to prevent bio-fouling and microbial induced corrosion, makes it a durable, cost-effective alloy to use in applications that need wave protection.<\/p>\n
\nTitanium has for many years been a gold standard for salt water corrosion resistance, being almost completely unaffected by marine environments. Experiments have been repeatedly performed where titanium was utilized in seawater and sea air situations for years at a time with no change at all. This corrosion resistance is due to the formation of a thin film which is formed by the oxidation of the metal referred to as TiO2. This material is resistant against any liquids containing chlorine.<\/p>\n
\nDesigned within the past 30 years, this alloy was specifically formulated to combat seawater corrosion \u2013 its sole developmental goal. It is not only economical compared to other options, but it is the ultimate performer when it comes to strength, weldability, and formability in saltwater environments. It\u2019s tensile strength demonstrates 75% higher allowable stresses than stainless steel 316 and more than twice as much for copper-nickel alloys by ASME standards. Also unlike steels, AL-6XN is resistant to SCC (stress corrosion cracking) in chloride. It is also resistant to microbial induced corrosion (MIC) which is common in a biosphere like the ocean \u2013 in fact it is preserved against corrosion to about +0.5 VSCE.\u00a0 Common uses include reverse osmosis desalinization units, power plant service water systems, and seawater heat exchangers.<\/p>\n","protected":false},"excerpt":{"rendered":"