One of the key factors for the quality of steel structure paint is derusting and rust prevention. The rust removal before painting is a concealed project of steel structure construction. Thorough derusting is an important guarantee to improve the inherent quality of paint.
At present, the pre-painting methods for steel structure engineering are mainly traditional methods such as mechanical shot blasting and sandblasting, manual electric grinding. If there is residual rust on the steel surface, the rust core will cause the steel substrate to continue to corrode even if it is rusted. Very clean, the surface area of ​​the new metal is increased, the amount of absorbed water is increased, and the possibility of corrosion due to the influence of environmental corrosive media is large. In this case, the paint coating often fails to meet the expected corrosion protection period, and even if the long-lasting anti-corrosion paint system is used, the rust-preventing time will be greatly reduced. Therefore, the key to the anti-corrosion of paint is that there is no longer any condition that the metal surface continues to rust.
JZ.CXFX-N Rotating Diamond is a special function coating agent for thick liquid. It is used as a new surface treatment material for anti-corrosion coating of steel. It only acts on rust and has the dual functions of rust removal and rust prevention. It can be directly applied to the surface of corroded steel members by brushing, wiping, spraying, etc. After 0.5-1 hour at normal temperature, the surface steel rust is converted into gray-black anti-rust substance, which is closely attached to the steel surface (adhesion level 1). , forming a high corrosion resistant film layer, as a bottom layer, can effectively improve the anti-corrosion quality of paint coating.
The film is dense (the thickness is about half of the thickness of the original rust layer, usually a few micrometers, and the curing is complete after 22 hours), and the insulation completely blocks the condition of further rusting, and the surface is smooth and rough, and the indoor rust prevention can reach one year. As the bottom layer of the paint, it can significantly improve the long-term effect of coating rust prevention and strengthen the heavy anti-corrosion ability. From the experience of using rusted diamonds JZ.CXFX-N with various different types of paints, the compatibility and bonding strength are very good. Because of its thorough rust removal and strong rust resistance, it can extend various paint systems. The anti-corrosion time limit is particularly obvious for ordinary anti-rust paints. Under the condition of standard construction, it can increase the anti-corrosion cycle by more than one time.
Due to the above properties of the new material, the existing problems in the production and processing of the steel structure can be solved, thus having the following construction advantages:
According to GB8923-88 "corrosion grade and descaling grade of steel surface before painting", even if the grade D rusted steel does not need to be shot blasting, sand blasting and rust removal, it can be directly sprayed and brushed to rust diamond JZ.CXFX-N. For the purpose of rust and rust removal, the rust removal level is equivalent to the Sa2.5 and St3 levels. This brings great convenience to field construction such as large components and complicated structures.
In the process of producing large and complex steel components in the factory, because the process of blanking, shot blasting, welding, etc. takes one week or even half a month, before entering the paint process, the surface of the polished steel surface appears secondary rust, directly causing the epoxy primer. Quality defects such as poor bonding and bubbling. This kind of material can completely overcome this problem by using rust and rust prevention functions.
Hot-worked heavy-duty steel surfaces are usually covered with a layer of millimeter-scale and very dense and hard steel blue oxide scale (chemical composition of Fe3O4). It is extremely difficult to completely remove the blasting and blasting. Fe3O4 is a natural form of iron ore and has stable properties. However, after contact with air, it will slowly oxidize to form loose red rust (chemical composition is Fe2O3). After coating the rusted diamond JZ.CXFX-N on the scale, the resulting rust-proof membrane layer can completely isolate the air and achieve the purpose of preventing corrosion.
During the construction process of steel structure engineering, the rust is removed during the construction process, and the rust is removed during the later use and maintenance. After simply removing the paint, oil and dirt, the material can also be directly applied. After 1-2 hours, it can be painted. paint. This kind of material has no damage to the paint, and the surface of the old paint is better combined with the new paint after being painted.
The method of using JZ.CXFX-N rust diamond is the same as that of paint. The construction specifications can be carried out according to the construction requirements of the paint in the Steel Structure Anticorrosive Coating Process Standard (508-1996). Since the viscosity of this material is much smaller than that of paint, and only the surface of the steel needs to be wetted, the coverage of 1 kg can reach 40 square meters, and the material consumption is about 1/8 of the paint.
JZ.CXFX-N is a non-toxic, odorless, non-polluting environment. It is suitable for all kinds of steel, cast iron and iron alloy. It only works with its corrosion products, and it does not damage the steel matrix. It does not cause any damage to the metallographic structure of steel. Therefore, the mechanical properties (tensile strength, elongation, yield point, cold bending performance, impact toughness) of steel are not affected.
Rotating diamond JZ.CXFX-N painting process
The application of the new material of rust diamond JZ.CXFX-N provides another new choice for the shot blasting and sandblasting rust removal methods in the steel structure industry. The difference between this process and the traditional process lies in the rust removal treatment before the paint coating. The process, which brings greater flexibility to the construction of steel structure engineering from factory production to outdoor installation.
Compared with traditional processes
Traditional process: blanking - shot blasting - welding - paint coating - installation -
New process: blanking - welding - spray rust removal - paint coating - installation -
The new coating process using the new material rust diamond JZ.CXFX-N rust has the following characteristics:
The new process replaces shot blasting or sand blasting with rust-removing diamond JZ.CXFX-N spray rust removal, which has the effect of energy saving and emission reduction: no need for machinery, no consumption of electricity, and no dust emission.
The rust removal process is placed after welding and before the paint is applied. The step and the paint process can be combined in one workshop to simplify the logistics process of the steel components, especially for the automatic coating production line.
Compared with the traditional process, for large complex steel components, there is no concern that the secondary rust is caused by the long welding time and the paint quality is affected.
Due to the anti-rust film formed by the rust-removing diamond JZ.CXFX-N after rust removal, it has super rust-proof ability. It will not cause secondary rust in indoor storage for one year, and can be used for half a year without outdoor rain. It can eliminate the need for immediate paint application and bring flexibility to the construction arrangement.
Extra large steel components, complex structural joints, components that cannot be shot blasted, and outdoor on-site construction, etc., without sand blasting and rust removal, direct spray rust removal, bringing technological changes to rust paint construction .
In the process of rust and rust removal, the rust-proof diamond JZ.CXFX-N is firmly bonded to the base metal through molecular bonding force. At the same time, the rust-preventing film layer formed is flat and compact, showing a microscopic network structure, and the paint polymer penetrates into it. Therefore, it has stronger bonding with paint. The film can be used with various types of paints (red dan, phenolic, asphalt, amino, alkyd, nitro, polyester, epoxy, ethylene, polyurethane, acrylic, etc.), plaster, paint (fire retardant coatings, powder coatings, etc.) Matching, there is no compatibility problem such as paint wrinkling and bubbling.
Combined with traditional processes
For the preservation of traditional production and processing habits and the need to remove oxide scale on a large scale, the application of the new material of JZ.CXFX-N is also provided as follows:
Comprehensive process: blanking - shot blasting - welding - spray rust removal - paint coating -
This kind of scheme can shorten the time of shot blasting and rust removal, and remove some rust and scale, and the remaining part is completely removed after spraying and rust removal after welding. The advantages are:
Even if the steel component is processed for too long, secondary rust will occur during the process, and it can be removed at the same time as spray rust removal.
Due to the corrosive nature of the soldering part, the solder is often the most susceptible to rust after painting. Spraying and derusting can also solve the problem.
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