Effect of Possivity on The Mechanical Machined Surfaces
Engineering and Technology Journal,
2007, Volume 25, Issue 1, Pages 1-8
AbstractThe object of this research is to study the passivity of parts surfaces
produced from steel and its alloy. The study steps include, preparing
specimens of low carbon steel ,with (dimension (20*30 cm) and its thickness (2
mm)). The specimens were immersed in a solution containing the following:
1. Caustic soda.
2. Sodium nitrate (1%)
3. Sodium cyanide (1.5%)
4. Sodium chromate (1.5%)
The influence of caustic soda concentrations, temperature of solution and
time of immersing on corrosion of specimens were studied, from which it has
been shown that it was possible to obtain the best passive surfaces of the parts
with caustic soda concentration (5%), time of immersing specimens (20 min)
and temperature of solution (45oC).
The results and conclusions obtained from this study were applied to treating
surfaces of some machining parts in Nasser State Company/central tool room
plan. The results show noticeable improvement in the corrosion resistance of
the metal used for more than 70 days.
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