overhead crane and gantry crane need crane primer painting, Intermediate coating, and Finish coating to prevent corrosion and ensure the working life. Dongqi offers custom crane coating paint. Yellow, Red, and Blue, etc. Check now.
Based on the electrochemical principle of steel corrosion, to coat the corrosion prevention layer to the steel surface is the most commonly used method. Commonly, there are three types of corrosion prevention layers:
Metal crane coating: A layer of metal is coated on the steel surface by electroplating, plating, electroless plating, hot dip, etc.
Chemical protective layer: A layer of anti-corrosion chemical compound film is coated on the surface of the steel by chemical or electrochemical methods.
Non-metallic protective layer: A layer of crane coating is coated on the surface of the steel by shelling-out and spraying to protect the steel, which is the most frequently used method.
Overhead crane primer coating, Inermediate coating, and final coating
Anticorrosive crane coating is the most commonly used method to protect the steel surface at present. The anticorrosive crane coating can be classified into three layers, the primer coat, intermediate coat, and finishing coat, each of which has its own specific features and functions. The three layers together form a composite crane coating to protect the steel from the corrosion, and prolong the working life.
Primer coat: Primer coat is commonly coated by the paint which is zinc rich primer and epoxy iron red primer.
Intermediate coat: Intermediate coat is painted by epoxy micaceous iron oxide and glass flake epoxy paint.
Finishing coat: Finishing coat mainly uses the epoxy paint and chlorinated rubber coat and polyurethane coat.
Confronted with various types of crane coatings and painting, how to make the right choice? The following tips are for your reference:
The local climate and environment of the application.
The ease of the construction conditions.
The correction usage of the layers of anticorrosive crane coatings.
The economy, durability and toxicity of the painting, etc.
On selecting the right crane coating, the thickness of the crane coating also matters.If the crane coating is too thin or uneven, the crane coating will have pinhole, from which the steel will get corrosion, and become into rusty bulge which will expand gradually, and finally the crane coating will drop off. If the crane coating is too thick, it may enhance the protection but also will reduce adhesion and mechanical properties, and increase the costs.
For the components which has common requirements to the crane coating, it usually needs two primer and two fish coat when manual and powered dedusting is used.
For the components which has higher crane coating requirements, it would be better that the primer should be painted two times, the intermediate lacquer 1 to 2 times, and the finish coat 2 time when a jet blasting is used.
The total dry film crane coating thickness is not less than 120μm (weak erosion) and 150μm (moderate erosion), 200μm (an important component of a strong erosion). The thickness of the film should be even, continues, no pinhole in order to achieve the good anti-corrosion effect.