【Corrosion Technology Edition】Daily Question 20170728: What is underscale corrosion?
Thread Content
To boost the popularity of the Corrosion Technology section, enhance communication among users, and promote mutual progress and improvement, the [Daily Question] activity has been launched. Reward rules: 3 wealth points for replying, 10 wealth points for a correct answer. This topic is valid for two days; no scoring or rewards will be given after that. Term explanation: What is underscale corrosion? Severe localized corrosion that occurs beneath deposits such as scale and rust is known as underscale corrosion. =================================== Event Promotion: Petrochemical Zone – “Creative Ideas for Energy Savings” event (the second phase is currently in full swing) http://bbs.hcbbs.com/thread-1666758-1-1.html (Source: Haichuan Chemical Industry Forum) 2017 Coal Chemical Industry Event – “My Technical Upgrades” http://bbs.hcbbs.com/thread-1786290-1-1.html (Source: Haichuan Chemical Industry Forum)
Under-deposit corrosion: When scale or deposited sludge forms on the heating surfaces of a boiler, the corrosion that occurs beneath this scale or sludge is known as under-deposit corrosion. Underscale corrosion can be either alkaline corrosion or acidic corrosion. It mainly depends on the substances contained in the boiler water and its pH value.
Corrosion caused by deposits on metal surfaces. After scaling occurs, the metal’s heat exchange efficiency declines, and this accelerates the corrosion of the metal
Severe localized corrosion that occurs beneath deposits such as scale and rust is known as underscale corrosion.
When scale or sedimented sludge forms on the heating surfaces of a boiler, corrosion occurs beneath that scale or sludge
When scale or sedimented sludge forms on the heating surfaces of a boiler, the corrosion that occurs beneath this scale or sludge is known as under-scale corrosion.
Under-deposit corrosion occurs when scale or deposited sludge forms on the heating surfaces of a boiler; the corrosion that takes place beneath this scale or sludge is known as under-deposit corrosion. Underscale corrosion can be either alkaline corrosion or acidic corrosion.
It is the corrosion caused by deposits on the metal surface; scaling can reduce the heat transfer efficiency of equipment and lower its production capacity； It increases the resistance to medium flow, raising the energy consumption of the conveying equipment. Scale can also cause under-scale corrosion in equipment, reducing its service life ； In severe cases, it causes blockages in the equipment, affecting the steady operation of the device and even leading to shutdowns. When scale or sedimented sludge forms on the heating surfaces of a boiler, the corrosion that occurs beneath this scale or sludge is known as under-scale corrosion. Underscale corrosion can be either alkaline corrosion or acidic corrosion. It mainly depends on the substances contained in the boiler water and its pH value.
Under-deposit corrosion occurs when scale or deposited sludge forms on the heating surfaces of a boiler; the corrosion that takes place beneath this scale or sludge is known as under-deposit corrosion. Underscale corrosion can be either alkaline corrosion or acidic corrosion. It mainly depends on the substances contained in the boiler water and its pH value.
Under-scale corrosion is the corrosion caused by deposits on the metal surface. Scaling can reduce the heat transfer efficiency of equipment and decrease its production capacity； It increases the resistance to medium flow, raising the energy consumption of the conveying equipment. Scale can also cause under-scale corrosion in equipment, reducing its service life ； In severe cases, it causes blockages in the equipment, affecting the steady operation of the device and even leading to shutdowns.
Corrosion caused by deposits on metal surfaces