1. P R E S E N T E D TO :
D R . N I D A I Q B A L
P R E S E N T E D B Y:
2 0 1 7 - B M E - 1 2
2 0 1 7 - B M E - 3 4
2 0 1 7 - B M E - 4 5
2 0 1 7 - B M E - 4 6
PRESENTATION:
ASSIGNMENT NO 3
2. Ringers solution
Ringer solution is a solution of several salts dissolved
in water for purpose of creating an isotonic solution
3. Effect of stainless steel in Ringer’s solution
Stainless steel is quite resistant in ringer’s solution as
compare to the mild steel because the weight loss of
stainless steel is less than mild steel
4. Effect of mild steel in ringers solution
Mild steel is not that much resistant in ringer’s
solution as compared to the stainless steel because
the weight loss of mild steel is more than stainless
steel.
5. Pitting corrosion in stainless and mild steel
Pitting Corrosion In Stainless Steel:
Pitting corrosion is a form of localized corrosion which
produces attack in the form of spots or pits.
depend primarily the pH value (acidity) and the
temperature.
6. Continue…
• Pitting Corrosion In Mild Steel:
The pitting potential of mild steel in bicarbonate chloride
solutions has been studied as a function of temperature.
Raising the temperature up to 90C restricts or completely
prevents the breakdown of passive film at chloride
concentration up to about 130 ppm.
7. Crevice corrosion in stainless and mild steel
Crevice corrosion is not unique to stainless steel.
It can occur in other alloys including those of aluminum,
titanium and copper.
It is localized form of attack, where there is a breakdown
of surface passive layer, in crevices or on the shielded
areas beneath surface deposits.
8. Explain the metal corrosion test in :
a) Potentio dynamic polymerization
It is a technique where the potential of electrodes is
varied at a selected rate by application of a current
through the electrolyte.
This technique is used in polarization of specimens for
corrosion testing.
9. Cyclic Anode Polarization Test
It refers to both anodic or cathodic polarization
techniques which are performed in a cyclic manner.
It is a short term exposure test.
It provide more information on both corrosion
characteristics and corrosion mechanics.
