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Grasp the reasons for steel layout corrosion and anti-corrosion methods can make more steel layout life extension, reduce the damage of some incidents, so it is very important to feel that this is very important, contact personal experience is summarized as follows:

New steel layout anti-rust new steel layout should be based on the nature of use, environmental media and so on to formulate anti-rust method covering method.

Coating apply cover method, apply in steel appearance namely cover a coating, make its scoop atmosphere is cut off, prevent rust. The primary construction process is: external rust removal, primer, paint finish; Metal coating method, that is, on the surface of steel plating a layer of other metals. The plating of the metal can make steel and other media barrier, but also can be the coating of the metal electrode potential is lower than iron, play a role of sacrificial anode (coating metal) to protect the cathode iron.

Original steel layout rust disposal 1, rust degree of classification and view. The classification of corrosion degree is to determine the degree of corrosion damage, which can be generally divided into five grades:

Level 1 - outstanding. There is no rust component, coating paint film and luster; A single member may have a few rust spots.

Level 2 -- some rust. Components no rust, face luanhe some fall off, the primer is intact; Individual member has a few rust spot, or member margin, dead Angle, crack, shade some have rust.

Level 3 - more severe. Components some rust, surface roll off the area of about 20%, primer also has some rust far away, its basic metal is intact, should be difficult to protect the operation.

Level 4 -- severe. The corroded area of the component reaches about 40%, the large piece of topcoat falls off, but the basic metal is not damaged, protection should be carried out immediately.

Level five - especially severe. After the basic gold has been replaced by rust or adopt reinforcement measures.

. According to the theory of shang corrosion and practical experience, besides the usual view, the following components or parts should be strictly viewed.

An aboveground neighbor of a buried person.

A place capable of holding water or of being corroded by water vapor.

The dry and wet replacement member is easy to accumulate ash and has high humidity.

Combined section clearance less than 12mm, difficult to paint parts.

Roof layout, roof truss joints, crane beam and column joints, steel thinking joints.

Generally, outdoor steel layout is easier to rust than indoor steel layout. Humidity is easy to accumulate ash some easy to rust; Welding erosion; Difficult to coat and brush parts easy to rust. Special attention should be paid to these areas when viewing.

Original steel layout anti-rust coating disposal including the disposal of old paint film, surface treatment, coating selection, coating construction.

. Paint film disposal paint film disposal methods are alkaline water cleaning (5% -- 10% NaOH solution), spraying, xu paint agent, the paste formulation: calcium carbonate 6 -- 10 parts, sodium carbonate 4 -- 7 parts. Water 80. 1-15 parts of quick lime mixed into paste; Or water part, potato starch 1 part, 50% concentration sodium hydroxide solution 4 parts, while mixing, add 10 parts of water mixing for 5-10min), etc.

Surface treatment surface treatment is to ensure the quality of coating, surface treatment includes rust removal and control of the roughness of the steel surface. Derusting can choose craft disposal, mechanical disposal, sandblasting disposal. Chemical disposal (pickling, alkali washing, etc.).

About the steel layout of anti-corrosion treatment to tussah is in the condition of not stopping production, cough sand and chemical treatment method can not be chosen, the first is to choose the craft and mechanical things rust.