Deposition of Thin Salt Films on Metallic Substrates

The corrosion underneath thin molten salt films is a major problem in some industries. A notable example is the "hot corrosion" of turbine blades in aircraft flying over marine atmospheres or land-based turbines located near the sea. Simulating this type of corrosion in the laboratory is important. Proper experiments can help in evaluating the mechanism of this phenomenon and guide the selection of appropriate materials for these environments. The first step in this research is to develop a technique to apply precise amounts of salt to the surface of metals. In this summer research project, a method called "salt-dripping" was investigated in order to obtain specific amounts of chosen salts onto selected metallic substrate with the goal of finding the most effective method of coating stainless steel 304 and 316 with a thin layer of a salt combination, i.e., sodium chloride (NaCl) and sodium sulfate (Na2SO4). The tests conducted were done to find an optimum method that could be used to form a thin uniform layer of salt, these methods include spraying the salt solution on the surface of my metallic alloy using a spray bottle or using a pipet to dispense the salt water on the coupon and using a cotton swab to distribute the salt water on the surface of the coupon. The results will be reported and discussed.