COLD CORROSION IS A PHENOMENON WHICH IS CAUSED DUE TO THE FORMATION OF SULFURIC ACID FORMED INSIDE THE CYLINDER DUE TO CONDENSATION OF WATER. THIS WATER CONDENSES AS THE DEW POINT OF WATER IS ACHIEVED AT LOW TEMPERATURE AND PRESSURE WHICH REACTS WITH SOX FORMED BY THE BURNING OF FUEL. TO FORM SULFURIC ACID.
THIS ACID CLINGS TO THE LINER AND CAUSES CORROSION. SINCE THIS CORROSION OCCURS AT LOW TEMPERATURE HENCE IT IS CALLED A COLD CORROSION. THIS OCCURS MAINLY AT SLOW STEAMING.
TO OVERCOME THE PROBLEM OF COLD CORROSION FOLLOWING STEPS CAN BE TAKEN :-
- MAINTAIN THE JACKET WATER TEMPERATURE OF CYLINDER.
- CYLINDER OIL SHOULD BE USED OF APPROPRIATE TBN.
- AVOID SLOW STEAMING OF ENGINE FOR LONG TIME.
- CYLINDER OIL FEED RATE TO BE INCREASED AT SLOW STEAMING/MANEUVERING.
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[…] SULPHUR WHICH REACTS WITH WATER WHILE BURNING INSIDE THE CYLINDER TO FROM H2SO4. THIS H2SO4 CAUSES COLD CORROSION, WHICH LEAD TO LINER […]