Q7. Identify the types of corrosion for the cases presented in Table Q7. (10 points) Case No Case description Type of corrosion 1 A brass pump used in seawater damaged within few months. 2 An undersea research station made of stainless steel is supported in the sea by a galvanized cable. 3 A 316 stainless steel pipe transfers deaerated seawater polluted with SRB. 4 A pipe carrying river water is corroded badly only at different 6 O'clock position in the line. 5 A 316 stainless steel valve handling 45% phosphoric acid has severe corrosion of the shaft only under rubber O-rings. 6 stainless steel weld repair (done at 600C corroded in the HAZ. 7 Low alloy steel furnace tube exposed to steam and oxygen at 420 C. 8 Gas turbine plates exposed to combustion gases contaminated with NaCl particles at 900 C. 9 Carbon steel plate exposed to naphtha and hydrogen - 500 C. Methane gas was observed. Carbon steel tube sheet of a waste heat boiler in a sulphur recovery unit - 110C. 10