Corrosion detection of metal pipeline
Tianjin Rong Da Testing Co., Ltd. contact: Wang Jingfu
Cell phone: 13102238283 QQ:3144667033
Telephone: 022-23892103
Erosion corrosion is the metal damage caused by high speed relative motion between metal surface and corrosion fluid. Usually in a static or low-speed flow of corrosive medium, corrosion is not serious, and when the corrosive fluid in high-speed movement, destruction of the metal surface can provide the surface coating or corrosion film protection, surface film thinning or removing accelerated corrosion and erosion corrosion, erosion and corrosion is the synergistic effect of fluid the results of.
The production of oil and gas engineering, offshore and marine erosion corrosion often occurs with all kinds of pipeline, petrochemical, energy, paper and other industrial fields and flow components such as exposure of various metals and alloys in the fluid motion. The erosion corrosion is more serious in the elbow, cubital tunnel, three, valve, pump, impeller, mixer, heat exchanger of import and export, changing the direction of fluid velocity and turbulence increases position. The metal surface erosion generally show a concave groove, teardrop shaped Valley, and the horseshoe shaped, bright surface and no corrosion product accumulation is dependent and flow is usually turbulent formed along the local direction of fluid or irregular surface. In these places the flow of water into the elbow is often turbulent and with air bubbles. The mechanical action of turbulence, and the impact of bubbles of oxygen in severe local corrosion, the depolarization effect caused by bending the pipe wall rapidly thinning, even piercing.
Scheme and standard of erosion corrosion test
The main methods include: rotating method, pipe flow method, impact jet method and high speed washing method, weight loss test method, electrochemical test method.
Simply put, scour is the physical process, the corrosion is generally considered a chemical process, so erosion corrosion is a chemical process fluid damage protective film on metal surface erosion physical process + corrosive medium react with the metal to metal corrosion by combining the results.
The characteristics of erosion corrosion of metal surface is obviously large hollow shape, medium fluid containing solid particles or suspended solids