Evaluating Corrosion Resistance of Metal Materials in Fire Productsvia Saltwater Spray Test Under Various Experimental Conditions

The brine concentration and salt spray time of KS D 9502, a saltwater spray test commonly used in Korea, were used to experimentally confirm the corrosion in iron, copper and stainless steel, and the degree of corrosion in fire extinguishers, automatic diffusion extinguishers, and residential automatic extinguishers. The results of the KS D 9502 brine spray test confirmed that there was little difference between iron and stainless under all test conditions, and that the results of the salt water test for copper were nearly identical to those of 5 wt% and 240 h (10 cycles). Unlike the two previous sets of conditions, the test results obtained at 5 wt% and 120 h of saltwater of the raw material showed very few visual (qualitative) and weight (quantitative) changes in corrosion, rendering these conditions unsuitable for the saltwater spray test. The saltwater spray tests in the fire extinguisher, automatic diffusion fire extinguisher, and residential automatic fire extinguisher showed that the results obtained at 5 wt% salt water and 240 h (10 cycles) and those obtained at 20 wt%, 240 h were nearly identical. These experimental studies show that the saltwater spray test of KS D 9502 is a variable in the corrosion resistance test, in which the time of the saltwater spray test is more important than the saltwater concentration.