Sodium Hypochlorite Industry
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Ruthenium-coated titanium anodes are an optimal choice for the electrolytic production of sodium hypochlorite, thanks to their impressive electrochemical properties and durability. In this process, sodium chloride (salt) dissolved in water undergoes electrolysis using these anodes, which triggers a uniform secondary chemical reaction that leads to the formation of sodium hypochlorite.
Diaphragm electrolysis is a technique frequently employed in this process. This method involves using a diaphragm to separate the anode and cathode compartments, enabling the controlled production of sodium hypochlorite in tablet or liquid form. This approach minimizes the formation of byproducts and ensures a higher concentration of the desired product.
The use of ruthenium-coated titanium anodes in the production of sodium hypochlorite offers several advantages, such as increased efficiency, reliability, and longevity of the anodes. Their corrosion-resistant properties make them suitable for handling the highly reactive chemicals involved in the process.
Sodium hypochlorite is a critical disinfectant with numerous applications in various industries. It is commonly used in water treatment plants for disinfecting drinking water, as well as in swimming pools to maintain water hygiene. In addition, sodium hypochlorite is an active ingredient in many household cleaning products, providing effective sanitization and stain removal.
In conclusion, the use of ruthenium-coated titanium anodes in the electrolytic production of sodium hypochlorite ensures a reliable, efficient, and sustainable process. This method yields a vital disinfectant with wide-ranging applications in water treatment, pool maintenance, and household cleaning.
Rust—your nontechnical friends and family will probably think this is all you deal with in your work in the corrosion industry. But we all know our work involves much more than this. This series of short articles—in honor of NACE International’s 75th Anniversary—attempts to paint a more positive and optimistic picture of the corrosion profession by looking at examples of successful resistance to the ravages of corrosion from around the world (and beyond) and from the distant past as well as present. It is designed to show that our chosen field is as interesting, historic, and artistic as any other.
Let’s start at the beginning. We know that corrosion is a reaction between a material and its environment, so why not have a look at the most corrosion resistant metal in the periodic table. According to ASM International’s Metals Handbook1 and numerous other sources, that superlative honor goes to one of the rarest elements, iridium. It is resistant to alkalis and acids, including boiling aqua regia (a mixture of nitric acid [HNO3] and hydrochloric acid [HCl]), as shown in Table 1. The only substances that will dissolve the metal are molten sodium cyanide (NaCN) and potassium cyanide (KCN).
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Iridium is a hard, brittle member of the so-called platinum group of metals in the periodic table. It is only a fraction less dense than the densest element, its neighbor osmium in the periodic table, and approximately double the density of lead. Iridium was discovered by Yorkshire chemist Smithson Tennant (1761-1813) in 1803, by separating and analyzing the residue left after dissolving impure platinum in aqua regia. It was named after Iris, the goddess of the rainbow, because its salts were so colorful.
World production of iridium is small, only a few metric tons (tonnes) per year, and it is one of the least abundant and most expensive metals. It is produced as a by-product of nickel smelting and has few applications as a pure metal. In a pure form, it is used for electrodes in high-performance spark plugs and crucibles for the preparation of single crystals of certain electronic and optical glasses. As an alloying element, it increases the corrosion resistance of titanium and palladium, and the strength, hardness, and corrosion resistance of platinum. Despite its corrosion resistance, you are most likely to come across iridium indirectly. It is one of the mixed metals in mixed metal oxide-coated titanium anodes for impressed current cathodic protection. Those involved in nondestructive testing may come across iridium-192 as an isotope in radiography.
There are two interesting facts regarding iridium not related to corrosion properties. One is that the last remaining base unit still defined by an artifact rather than a fundamental constant of nature is the kilogram, which is a cylinder of platinum with 10% iridium kept under nested bell jars at the International Bureau of Weights and Measures near Paris, France. The iridium is added to increase the hardness to resist wear during cleaning. It is expected that a new definition of the kilogram based on fundamental physical constants will be adopted within the next year or two.
Second, iridium is probably best known because of its association with the likely cause of extinction of the dinosaurs. The rocks in the boundary layer between the Cretaceous and Tertiary geological periods, laid down ~65 million years ago, contain a higher proportion of this element than other rocks. An iridium-enriched meteor is believed to have hit Mexico’s Yucatán Peninsula, and dust from the impact caused darkening of the skies that wiped out most large animals.
Source: NACE International member Robert A. Francis, Ashburton, Victoria, Australia—email: Robfrancis766@gmail.com.
Reference
1 J.R. Davis, ed., Metals Handbook Desk Edition, 2nd Edition (Materials Park, OH: ASM International, 1998).
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