How to prevent ship corrosion by application of Marine Paint

1. How to prevent ship corrosion by application of Marine Paint Marine Coating are a type of protective coating used mostly in the marine environment to protect ship, vessels, tankers, and other materials from saline water or fresh water. The paint system applied to any part of a ship will be dictated by the environment to which that part of the structure is exposed. Traditionally the painting of the external ship structure was divided into three regions. 1. Below the water line where the plates are continually immersed in the sea water 2. The water-line region where immersion is intermittent and a lot of abrasion occurs. 3. The top side or top structure exposed to the atmosphere laden with salt spray and subject to damage through cargo damage. Protection by means of Paints Its assumed that all paint coating helps to prevent attack on the metal covered simply by excluding the corrosive part whether on air or water. There is certain pigment in paints confer protection on steel even where it is exposed at a discontinuity. Zinc dust is a commercially available pigment which fulfils this requirement for coating steel in a salt water environment. The zinc dust is the sacrificial anode with respect to the steel. The greater the time spent at sea the less the fouling; but areas of operation and seasons also decide the amount of fouling, and with modern anti-fouling compounds the problem today is less important. The most common methods employed to prepare steel surfaces for painting are: i)Blast-cleaning ii)Pickling iii)Flame-cleaning iv) Preparation by hand Preparation and Precautions Painted surfaces should always be rubbed down wet to reduce dust from the old paint, which may be toxic if inhaled. Where the dust is known to contain lead, other dust treating methods should be used. Dust masks should be worn as protection against other dusts. Rust removers are acids and contact with unprotected skin should be avoided. Eye protection should be worn against splashes. When painting is done in the vicinity of machinery or from an overhead crane gantry, the power supply should be isolated and the machine immobilized in such a way that it cannot be moved or started up inadvertently. Appropriate warning notices should be posted. Close-fitting clothing should be worn.

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