Spectrophotometric Method for the Determination of Atmospheric Cr Pollution as a Factor to Accelerated Corrosion

Table 1

Number of days required for the formation of corrosion products (rust) under different laboratory exposure conditions.

Experiment group	Exposure conditions	Number of days to rust
		pH
		3	5	7	9
1	Humid air	15	19	NO	NO
2	Humid air + Cr(VI)	11	15	35	NO
3	Humid air + SO2	9	13	25	31
4	Humid air + Cr(VI) + SO2	9	12	21	31
5	Humid air + Cr(VI) + SO2 + Fe^+2	7	15	20	17

NO: not observed in 60 days.