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Research on the corrosion resistance of copper steel
:kpril, I916.]
Color Red
Yellow Green Blue
NELA
R_ESEARCH LABORATORY
NOTES.
5gI
Pre~xposure time, U,, = 30 seconds Equality time, t¢ Right first, Left first, Space error, Corrected value, seconds seconds seconds seconds 86.2 92.5 3.2 89.4
(A. D . ~ 2.2)
(A. D. -~ 3.0)
90.6 (A. D . ~ 2 . I ) 91.5 (A. D . = 3.I) 76.5 (A. D . = 1.8)
95.3 (A. D . ~ 1.6) 93.3 (A. D.=3.8) 89.1 (A. D.=3.8 )
2.4
93.0
o.9
92.4
6.3
82.8
Pre~xposure time, t2, =300 seconds
Red Yellow
Green Blue
I56.8 (A. D.=4.7)
143.9 (A. D. ~---2.3)
--6.5
I5O.4
18o.o
164.1
-8.0
172.1
(A. D.=6.5) 162.4 (A. D . - - 4.o) 147.2 (A. D. ~---3.8)
(A. D . = 4.5)
I52,4
-5.o
167.4
(A. D.=3.7) 146.3 (A. D.--~ 4.3)
-0.5
146.8
Since tq, f o r tp= 300, represents closely equilibrium conditions of sensitivity, it m a y be called the " equilibrium time." T h i s w o r k is n o w being repeated with o t h e r subjects and u n d e r i m p r o v e d conditions. T h e results are ultimately intended to test a theoretical equation f o r tq=f(tp), deduced f r o m assumptions with r e g a r d to the chemical nature of the retinal process.
Research on the Corrosion Resistance of Copper S t e e l D . M . BUCK and J. O. HANDY. (The Journal of Industrial and Engineering Chemistry, vol. 8, No. 3, March, I 9 1 6 . ) - - S h e e t steel and ironcontaining copper show greatly-increased corrosion resistance when exposed to atmospheric conditions. The most effective amount of copper to be used for this purpose is approximately 0.2 5 per cent. Smaller amounts of copper down to as little as 0.0 4 per cent. have a considerable influence in lessening corrosion, but the results are not so good as with the higher amount. Previous investigation has indicated that o.i 5 per cent. copper is in nearly all cases as efficient as 0.2 5 per cent. Higher amounts of copper up to 2 per cent. give little or no added benefit. Copper is as necessary in the so-called " pure irons " to insure corrosion resistance as it is in normal open-hearth and Bessemer steels.
Color Red
Yellow Green Blue
NELA
R_ESEARCH LABORATORY
NOTES.
5gI
Pre~xposure time, U,, = 30 seconds Equality time, t¢ Right first, Left first, Space error, Corrected value, seconds seconds seconds seconds 86.2 92.5 3.2 89.4
(A. D . ~ 2.2)
(A. D. -~ 3.0)
90.6 (A. D . ~ 2 . I ) 91.5 (A. D . = 3.I) 76.5 (A. D . = 1.8)
95.3 (A. D . ~ 1.6) 93.3 (A. D.=3.8) 89.1 (A. D.=3.8 )
2.4
93.0
o.9
92.4
6.3
82.8
Pre~xposure time, t2, =300 seconds
Red Yellow
Green Blue
I56.8 (A. D.=4.7)
143.9 (A. D. ~---2.3)
--6.5
I5O.4
18o.o
164.1
-8.0
172.1
(A. D.=6.5) 162.4 (A. D . - - 4.o) 147.2 (A. D. ~---3.8)
(A. D . = 4.5)
I52,4
-5.o
167.4
(A. D.=3.7) 146.3 (A. D.--~ 4.3)
-0.5
146.8
Since tq, f o r tp= 300, represents closely equilibrium conditions of sensitivity, it m a y be called the " equilibrium time." T h i s w o r k is n o w being repeated with o t h e r subjects and u n d e r i m p r o v e d conditions. T h e results are ultimately intended to test a theoretical equation f o r tq=f(tp), deduced f r o m assumptions with r e g a r d to the chemical nature of the retinal process.
Research on the Corrosion Resistance of Copper S t e e l D . M . BUCK and J. O. HANDY. (The Journal of Industrial and Engineering Chemistry, vol. 8, No. 3, March, I 9 1 6 . ) - - S h e e t steel and ironcontaining copper show greatly-increased corrosion resistance when exposed to atmospheric conditions. The most effective amount of copper to be used for this purpose is approximately 0.2 5 per cent. Smaller amounts of copper down to as little as 0.0 4 per cent. have a considerable influence in lessening corrosion, but the results are not so good as with the higher amount. Previous investigation has indicated that o.i 5 per cent. copper is in nearly all cases as efficient as 0.2 5 per cent. Higher amounts of copper up to 2 per cent. give little or no added benefit. Copper is as necessary in the so-called " pure irons " to insure corrosion resistance as it is in normal open-hearth and Bessemer steels.