The corrosion of metals is a universal matter in the shipbuilding industry, which causes serious direct or indirect losses and damages out of purpose. In accordance with the surroundings, the corrosion may be classified as chemical medium corrosion, atmosphere corrosion, sea water corrosion and soil

As it is known to all, steel is widely used in shipbuilding since it acts as cheap structural materials. But its corrosion has turned out a big problem. Therefore, effective anticorrosion precautions have to be taken to reduce the loss resulting from the steel corrosion.

Up till now, the protection coating on steel plates has remained one of the chief means of steel anticorrosion. The service life of a protection coating is related to various factors, such as the rust removal on the surface, the thickness of coating, the composition of paint, the painting process adopted, etc.

From a long practice and through a trial-and-error experiment, people have come to know the quality of rust removal on steel surface is the most important factor in the performance of a protection coating.

To minimize the hull corrosion, marine steel plates must go through rust removing and primer painting. In general, there are two ways to carry out the process.

One way is to remove the rust and oxide on steel plates by shot-blasting or acid-pickling, and then to paint them with a rust-proof primer. The other way is to shot-blast a whole

section, sometimes even a whole hull, and then to paint it with a rust-proof primer as well.

In order to raise the production efficiency, an automatic production line for the steel plate pretreatment is to set up in a shipyard. The whole process may cover calibration, rust removal, primer painting,drying and material marking of steel plates. With regard to the quality check of the rust removal there are generally two standards, namely, cleanness and roughness. The former refers to whether there is any remains of oxide on steel plate surface which will affect a protection coating to a great extent; while the latter has much to do with the protection performance of a coating because it directly affects the coating adhesiveness to steel plates and the distribution of coating thickness.

To protect a vessel from corrosion, special attention must be paid to, apart from the emphasis on the quality of the surface treatment, the choice of paints, quality of paints, reasonable composition of paints, correct application of paints, best operation

surroundings of painting, appropriate methods of painting and effective protection for coatings.

As mentioned before, the whole painting process is also referred to as the painting outfitting which has been becoming more and more important nowadays. For painting, in addition to its protection function will give you a fine appearance, and a fine appearance will always please the ship's owner.

(continued)

 

• Securing anchor and chain cable method - 2012-11-16 - 04:00:27
• Securing and stowage of anchor - 2012-11-16 - 03:16:45
• Stabilising systems for ships - 2012-11-15 - 08:12:48
• Small Angle Stability for ships - 2012-11-15 - 05:33:01
• Theory of Hull resistance - 2012-11-15 - 03:34:04
• Theory Hull Stresses for Ships - 2012-11-15 - 02:41:04
• Application of Computers in shipbuilding industry (2) - 2010-01-02 - 10:57:17
• Application of Computers in shipbuilding industry (1) - 2010-01-02 - 10:55:49
• Quality Management in shipbuilding industry (3) - 2010-01-01 - 11:49:49
• Quality Management in shipbuilding industry (2) - 2010-01-01 - 11:48:21

• < Prev
• Next >