| 配方类型： |
SOAPS AND CLEANERS |
| 配方说明： |
Alkaline Descaling of Rust |
| 配方组成： |
Sodium Gluconate/20.0
Soda Ash/3.5
Heavy periodic reverse current, cooling to about 125'F (to reduce
hydrolysis of NaCN to ammonia), 3 minutes immersion. The EDTA
derivatives serve to speed up the action of the "Seqlene" and in this
concentration will not cause etching nor darkening of the work. Various
plants use minor variations of this formula; e.g., 1 lb NaCN/gal with
0.75 lb NaOH/gallon. A source of current at 6 or 12 v is required and
current density should be not less than 50 amperes/sq ft. A common cycle
is 20 seconds direct, 10 seconds reverse.
A promising experimental formulation, to avoid the NaCN and current, is
(to gallon) 2 lb NaOH, 1 lb "Seqlene" 540, 1 lb EDTA. Conditions: 200'F,
30 minutes immersion.
The life of the bath in this process is still unknown. Most present
users have yet to dump a bath, merely adding make-up cyanide, caustic
and chelating agents. No way has yet been found to regenerate the
"Seqlene" (b |
| 配制方法： |
Use 1-3 lb to gallon, at room temperature, 1-24 hr or 3-5 lb to gallon, 180' to boiling, 2-30 minutes. |
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