Organic Chemicals and Fuels

The tests were on hot dip galvanized steel strips exposed to commercially pure chemicals in stoppered bottles for a minimum of 100 days at ambient temperature with part of the sample being fully immersed and part exposed to vapors the compatibility (i.e., the effect of contact with zinc on the chemical properties of the test chemical) is observed. In Table 5.6, most of the chemicals listed are rated as less than 13 p,m/year ( 0.5 mm/year), which was regarded as low enough to show that zinc is compatible with the chemical involved further investigation may be necessary to determine whether the rates were in fact much lower and the chemical suitable for use with relatively thin zinc coatings. 

Relatively few organic chemicals in the group are rated as unsuitable for use in contact with zinc. 

Information on organic chemicals from other tests is given in Table 5.7. The corrosion of zinc in primary alcohols has been studied by Heitz et al. 

Air entrapped during encapsulation and vapor from polymeric materials such as epoxy resin can cause corrosion. The corrosive effect of vapors from plastics, rubber, and wood on zinc and cadmium has been tabulated by Knotkova-Cermakova and Vickova (1971) other work, including electroplated zinc-nickel alloys, has been discussed by Donovan and Stringer 

at 85°C and 95% relative humidity, zinc can deteriorate in contact 

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