Calcium corrosive solutions attack

It is attacked, for example, by calcium hydroxide solutions at room temperature, including waters that have been in contact with fresh Portland cement. Organic acids harmful to lead can be leached from wood structures, particularly damp timber including western cedar, oak, and Douglas fir. This cause of corrosion can be prevented by fully drying the wood, treating it to prevent contact with moist air, or inserting a moisture barrier between wood and lead [3]. 

The most widely used anodic inhibitors are calcium and sodium nitrite, sodium benzoate and sodium chromate. With the exception of calcium nitrite, no other chemical is available in North America as a proprietary product. Nitrites have been used in the USA for more than 14 years and for nearly 40 years in Europe. Calcium nitrite is marketed as a non-chloride accelerator, as well as a corrosion inhibitor. For 25-30% solids in solution, dosage rates range from 2 to 4% by weight of cement depending on the application [50]. Calcium nitrite has been used in bridges, parking and roof decks, marine and other prestressed concrete structures that are exposed to chloride attack. 

French) or BROMOFORMO (Spanish) (75-25-2) CHBrj Noncombustible liquid. Violent reaction with chemically active metals, acetone, calcium, strong caustics, potassium, potassium hydroxide, sodium hydroxide. Increases the explosive sensitivity of nitromethane. Incompatible with crown polyethers, sodium-potassium alloys. Forms friction- and shock-sensitive compounds with lithium. Aqueous solution is a medium-strong acid. Liquid attacks some plastics, rubber, and coatings. Corrosive to most metals in the presence of moisture. Thermal decon osition products include highly toxic carbonyl bromide and hydrogen bromide fumes. On small fires, use dry chemical powder (such as Purple-K-Powder), foam, or COj extinguishers. 

Anhydrous NaOH reacts very slowly with most substances, at room temperature it attacks most metals only slowly (iron, magnesium, calcium). The corrosion rate increases rapidly with increasing temperature. Amphoteric metals such as zinc, aluminum, tin and lead are attacked by dilute NaOH solutions at room temperature, iron,... 

CALCIUM HYPOCHLORITE. Ca(ClO)2-2 H O. Solid calcium hypochlorite was corrosive ( 27 mpy) to alloy 3(XX3 and caused moderate attack 10 mpy) of alloy 5154 in laboratory tests under conditions of 100% relative humidity at ambient temperature. In other laboratory tests, aqueous solutions, except those at very low concentrations, were corrosive to 3003 aUoy at ambient temperature. Aluminum baskets and rotary driers have been used with calcium hypochlorite. See also Ref (1) p. 128, (2) p. 104, (3) pp. 73, 247, (7) p. 47. 

Dry aluminium nitrate does not attack aluminium. Its solutions have a slight action at room temperature the dissolution rate is in the order of 0.4 mm per year at 20 °C. At higher temperatures, the hydrolysis of aluminium nitrate releases nitric acid, which, due to its low concentration, may attack aluminium. The dissolution rate is 10 times higher at 50 °C than at 20 °C, and in addition, pitting corrosion is observed. Aluminium nitrate can be produced (from calcium nitrate and aluminium sulphate), stored and transported in aluminium equipment. 

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