Role of Anticorrosive Coatings and Thickness Measurement

From:Linshang Time:2020/02/27 11:44:26 Browse:179
This article briefly describes the causes of pipeline corrosion, the role of anticorrosive coatings and performance requirements. It focuses on the thickness detection of anticorrosive coatings on pipelines by anticorrosive coating thickness gauge.

With the continuous and rapid development of China's economy, the demand for energy continues to increase. The amount of pipeline construction is also increasing. The various gas supply, water supply and heating pipelines to be constructed in various urban planning are even more numerous, which makes pipeline corrosion protection becomes more and more important, which is directly related to the anticorrosive performance and operating life of the pipeline. Therefore, it is of great significance to strengthen the research on the anticorrosive coating of pipelines for the corrosion control of the entire pipeline. The anticorrosive coating thickness of pipelines can be detected by using the Linshang anticorrosive coating thickness gauge.

1. The cause of pipeline corrosion

Corrosion refers to the chemical and electrochemical interactions between the surface of metal materials and environmental media, causing the degradation and destruction of materials. The common corrosion of oil pipes is mainly caused by corrosive substances such as CO2, H2S, C1﹣ dissolved in crude oil, a small amount of dissolved oxygen and bacteria, which directly interact with metals and cause chemical corrosion.

The harm of chemical corrosion is not great. The main cause of the pits on the steel pipe surface and even the perforation comes from the electrochemical corrosion. When the metal undergoes an electrochemical reaction, the part with the lower electrode potential easily loses electrons and becomes the anode; the part with the higher electrode potential gets electrons and becomes the cathode. In the presence of O2 and H20, Fe (OH) 2 generates hydrated iron oxide, which causes corrosion.

2. Function and performance requirements of anticorrosive coating

(1) The role of anticorrosive coating

anticorrosive coating on pipes

The anti-corrosion principle of the anti-corrosion layer is mainly to prevent corrosive media such as H2O, Cl-, SO2 in the environment from penetrating into the metal surface, so that the corrosive medium is isolated from the metal surface, thereby preventing metal corrosion. The main functions of pipeline anticorrosive coating are as follows: Shielding effect, corrosion inhibition performance, sacrifice anode protection, performance improvement.

(2) Pipeline anticorrosive coating performance requirements

In order to improve the anticorrosive performance of the coating and maximize the anticorrosive effect of the coating, combined with the actual situation of pipeline anticorrosion, the requirements for the anticorrosive coating performance are as follows: good stability to corrosive media, good impermeability and low water absorption, good mechanical strength and excellent electrical insulation.

3. Thickness inspection of pipeline anticorrosive coating

For the inspection of pipeline anticorrosive coating thickness, there are many inspection schemes and tools in the industry. However, these schemes and detection methods may be relatively troublesome. The LS223 anticorrosive coating thickness gauge manufactured by Linshang Technology can quickly and easily solve our problems. Because LS223 anticorrosive coating thickness gauge has the following characteristics:

anticorrosive coating thickness gauge

(1) Simple operation

Most coating thickness gauges need to be calibrated with multiple standard boards of different thicknesses before testing to ensure the accuracy. However, Linshang LS223 anticorrosive coating thickness gauge adopts the design of triggering automatic startup. After startup, we only needs to make zero adjustment without tedious calibration.

(2) The measurement accuracy conforms to national standards

The Linshang anticorrosive coating thickness gauges ensure the stability and test accuracy of the instruments before leaving the factory.     The instrument are sent to Chinese national metrology institute to ensure that they pass the measurement. Athe anticorrosive coating thickness gauge manufacturer can also provide customers with metering and testing services.

(3) Wide measurement range and applications

The thickness of the anticorrosive coating has different requirements. The range of a common coating thickness gauge is up to 2000μm, that is, 2mm. Linshang LS223 anticorrosive coating thickness gauge uses a split design. The probe is flexible and replaceable. There are two types of probes that can measure 3mm and 5mm. 

(4) Imported raw materials and accessories to ensure service life

The probe of Linshang anticorrosive coating thickness gauge adopts ruby which is wear-resistant and corrosion-resistant. Good components determine good quality.

Related Articles