Paint Thickness Meter | Anticorrosive Coatings for Steel Structures

From:Linshang Time:2020/04/08 12:00:00 Browse:140
Although the steel structure looks very strong, long-term contact with air and water will inevitably cause corrosion and rust. Anti-corrosion paint and paint thickness meter are needed for the anticorrosive coating.

1. Types of anticorrosive coatings for steel structures

(1) Solvent-based zinc-rich primer

(Inorganic or epoxy) workability is good and the surface treatment requirements of the substrate are slightly lower: usually inorganic zinc-rich primer requires cleanliness Sa level 2.5, roughness Rz40-80 microns; epoxy zinc-rich primer requires clean Degree Sa 2.5, the parts that can only be processed manually (St 3) can also be used. The roughness requires Rz30-60 microns.

(2) Water-based zinc-rich primer

One kind of water-based paints represents the development direction of zinc-rich primers. The shortcomings of the current domestic water-based zinc-rich primer is that it is not suitable for low-temperature construction

(3) Aliphatic acrylic polyurethane topcoat

It has excellent weather resistance and mechanical properties. So far, the most effective and classic matching recognized by the corrosion protection industry is still epoxy intermediate paint, zinc-rich primer and polyurethane topcoat.

2. Main points of steel structure anti-corrosion coating construction

  1. Before construction, the surface of the steel structure should be derusted. Anti-rust treatment should be determined according to the requirements of use.

  2. The debris on the steel structure surface should be cleaned. And the gaps at the joints should be filled with anticorrosive paint or other anticorrosive materials before construction.

  3. During construction, parts and other objects that do not require anti-corrosion protection should be shielded and protected. The newly applied coating should be protected from dirty liquid pollution and mechanical impact.

  4. Construction anti-corrosion coatings should be carried out before indoor decoration and under conditions that will not be damaged by subsequent projects.

  5. During the construction process and before the coating is dried and cured, the temperature should be maintained at 5 to 38 ° C, the relative humidity should not be greater than 90%. And the air should be circulated. When the wind speed is greater than 5m / s, or when there is condensation on the surface of the rainy day, it is not suitable for operation.

  6. Real-time detection of anti-corrosion coating thickness. If the coating is too thin, it will lead to premature failure of the coating. At the same time, the uniformity of the coating is an important process parameter, so we can use a professional paint thickness meter to measure the coating thickness. In addition, the following points should be noticed when choosing anti-corrosion paint thickness meter:

  • The anti-corrosion paint thickness meter must be accurate enough. The best paint thickness meter manufacturer promises that the instrument can pass the measurement of Chinese Metrology.

  • The method of using the instrument should be simple enough. Most anti-corrosion paint thickness meters on the market require tedious calibration before the instrument can be calibrated. Generally, non-professionals are very easy to cause misoperation. Therefore, the portability of the paint thickness meter is very important.

  • The service life of the paint thickness meter must be guaranteed. In this regard, it can be seen from the technical parameters of the products provided by the manufacturer. The probe of a good anti-corrosion paint thickness meter generally uses ruby and the common instrument uses steel material. Ruby has the characteristics of wear resistance and corrosion resistance. It makes sure the service life of the instrument is longer.

The paint thickness meter independently developed and produced by Linshang Technology is an iron-aluminum dual-use paint thickness measurment equipment. The paint thickness meter automatically recognizes the base material and the operation is more convenient. The measuring range of different instruments is different, to meet a variety of measurement needs, up to 5mm.

Linshang paint thickness meter uses magnetic induction and eddy current principles to non-destructively detect the thickness of coatings or electroplated layers on metal substrate. The principle of magnetic induction requires that the substrate material of the coating or plating layer is iron, steel and other metals with good magnetic permeability. The coating or plating layer on the surface is a non-magnetic material. The workpieces are calculated by measuring the magnetic induction intensity and the coating thickness of the probe.

The principle of eddy current is to change the oscillation frequency according to the eddy current effect of the metal substrate. The frequency change is related to the thickness of the non-metallic material between the substrate and the probe. The thickness of the non-metallic coating is obtained by calculation. At the same time, the accuracy of the three paint thickness meters independently developed and produced by Linshang Technology is consistent with the accuracy of the Germany brand Q-nix. It is currently the highest precision paint thickness measuring equipment among Chinese paint thickness meters. The LS221 and LS223 separate paint thickness meters are suitable for narrow test environment. The probe can be extended into the test point for testing. We can hold the host for data reading with another hand.

The types of steel structure anti-corrosion coatings and construction points are as above. Steel structure anti-corrosion coatings have professional functions and effects. 

Related Articles