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In cold and heavy snowfall regions such as Europe and North America, substantial quantities of rock salt are spread on roads for the prevention of icy road surfaces and car slipping so that winter transportation can be assured. Such salt however promotes corrosion not only of automotive bodies but also of automotive parts. Automotive piping is no exception, leading to the need for new surface treatment. With a view toward finding a promising substitute for Zn plating which has been used for many years, various high corrosion resistance surface treatments have been compared. This paper reports the results of the comparison.

Alcohol-blended fuel is receiving increasing attention for its ability to provide cleaner automotive exhaust gas. Alcohol-blended fuel is however more corrosive than conventional gasoline and tends to corrode the materials of a fuel system. Use of nylon tubes or stainless steel tubes is now studied but is still accompanied by the unsolved problems of gas penetration and higher cost. As a technique pertaining to alcohol-blended fuel, single-wall tubes having excellent corrosion resistance have been developed by forming a Ni-base double plating layer on the inner walls of fuel pipes. Their corrosion resistance was evaluated using alcohol-blended fuel and the like.