AT eg ee ee 
16,5 
Corrosion (grams of iron). 
— 
© 
Heise and Clemente: Corrosion of Iron 445 
Potassium dichromate concentration grams of Ky Cr2g O; in 400 cc. Hy SO,. 
F 10 [5 20 25 30 aS 
/ Bre Pe ry -- oad 
t Rien oe 
/ 
t 
/ 
/ 
: 
4 
f 
/ 
/ 
e 
i 
/ fs b 
if = 
1 N 
A / Ba 
T .- 
i aa 
I \ 
iT, \ 
Y \ 
\ 
\ 
\ 
+ 
\ 
\ 
\ 
\ 
v 
\ 
\ 
\ 
. ae 
\ 
\ 
\ 
\ 
4 
\ 
\ 
\ 
\ 
T 
\ 
\ 
| er 
3 X 
Fig. 1. The effect of potassium dichromate on corrosion of iron in sulphuric 
acid. Line a, 0.5 N sulphuric acid, 20 hours; line 6, N sulphuric acid, 21 hours ; 
line c, 2 N sulphuric acid, 22 hours. 
