Electrolytic passivated tin plated steel
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example 2
[0014]A five percent solution of hydroxyl acetic acid was added to a 0.5% solution of food grade hydrolysable tannic acid and the PH of the mixture was then adjusted to a PH of 9.0 by the addition of potassium hydroxide. This solution was then used in an electrolytic cell in which the tin plated steel was made the anode and a high grade stainless steel panel was used as the cathode. 7.5 volts and a current density of about 50 amps per square foot were passed through the cell for three seconds. The tin plated steel panel was then removed, rinsed in D.I. water, dried and then placed in a 0.6% cysteine solution adjusted to a PH of 7.0 by the use of tri sodium phosphate and boiled for one hour to remove all oxygen in accordance with testing procedures outlined by “Mittal Steel USA”. The outer tin layer did not yellow after one hour of exposure to the sulfide staining solution indication that a hydroxyl organic acid was needed to passivate the tin.
example 3
[0015]A six percent solution of hydroxyl acetic acid and 0.5% phthalic acid was adjusted to a PH of 9.0 by the addition of potassium hydroxide. This solution was then used in an electrolytic cell in which the tin plated steel was made the anode and a high grade stainless steel panel was used as the cathode. 7.5 volts and a current density of about 50 amps per square foot were passed through the cell for three seconds. The tin plated steel panel was then removed, rinsed in D.I. water, dried and then placed in a 0.6% cysteine solution adjusted to a PH of 7.0 by the use of tri sodium phosphate and boiled for one hour to remove all oxygen in accordance with testing procedures outlined by “Mittal Steel USA”. Within a five minute period of time, the outer edges of the panel became a dark black which then spread to the rest of the panel while the outer layer of tin remained silvery in color and then began to slowly turn yellow in color. An analysis to the panel showed the presence of a thi...
example 4
[0016]A five percent solution of hydroxyl acetic acid was added to a 0.5% solution of food grade hydrolysable tannic acid and the PH of the mixture was then adjusted to a PH of 9.0 by the addition of potassium hydroxide. This solution was then used in an electrolytic cell in which two tin plated steel panels were made the anode and a high grade stainless steel panel was used as the cathode. Seven point five volts and a current density of about fifty amps per square foot were passed through the cell for three seconds. The tin plated steel panels were then removed, rinsed in D.I. water and dried.
[0017]One of tin plated panels was placed in an oven at 400 degrees F. for thirty minutes in accordance with testing procedures outlined by “Mittal Steel USA”. The panel showed no traces of yellow tin oxide.
[0018]The second tin plate panel was first rinsed with a one percent hydroxyl acetic acid solution to remove any unwanted alkalinity and then coated with “Valspar 6256054 GLDEPOXY” accordin...
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