Corrosion

ENGINEERING SECTION C TEACHER'S NAME : MISS HIRA SULTAN DATE : Table of Contents Serial No. Topics Page No. 1 Corrosion 3 2 Electrochemical Theory of Corrosion 3 3 Types of Electrochemical Theory of Corrosion 4  Oxygen Absorption 4  Hydrogen Evolution 5  Galvanic Corrosion 6-7  Concentration Cell Corrosion 8-10 4 References 10 Corrosion Corrosion is the usual process and it occurs because of natural inclination of metals to make their more…

pressure (PCO2) is related to solution pH as well. In the condition where scale-free CO2 corrosion occurs, the increase of PCO2 will increase the corrosion rate. This can be explained by the increment of H2CO3 concentration…

issues and problems including fighting corrosion, making glucose biosensor to monitor the sugar levels for diabetic patients, making lubricants to help reduce the frictions between two substances, making semiconductors that are used in many modern electronic devices such as computers and cell…

Corrosion is called rust. The example of common corrosion are corrosion of metal and iron. Corrosion on metal occurs due to the interaction between metal and the environment that is corrosive, i.e. humid environments(containing water vapor) and induced by the presence of O2, CO2, or H2S. Corrosion can also occur due to high temperature. Corrosion on metals can also be viewed as the process returns to its original state of metal, namely metal ores. For example, corrosion on the iron becomes…

evaluate the bio-degradation behavior of Mg-Zn-RE and Mg-Zn-RE-xCa alloys. The results (Fig. 1) revealed that the corrosion potential, Ecorr of Mg-Zn-RE alloy was -1841 mV, which was more negative compared with the Mg-Zn-RE-0.5Ca. This phenomenon indicates that the cathodic reaction was more difficult in quaternary alloys compared to the ternary…

many industrial chemicals, and stain resistance; good light stability and low temperature-cure characteristics [1]. 1.2 Corrosion Corrosion is…

(Rs+Rpo+Rct) in different seawater’s salinity could be arranged as R30.04‰> R33.01‰> R29.84‰> R32.37‰. Usually, the smaller value of polarization resistance was, the larger corrosion current was, indicating the worse corrosion resistance of the coating. Therefore, the coating in seawater’s salinity of 30.04‰ showed the best anti-corrosion…

Beryllium General Characteristics According to Hornbostel (1991), Beryllium is a hard, exceptionally, lightweight, gray-white metal, corrosion resistant at ordinary temperatures; chemically it is related to aluminum. Other than titanium, it is the only light metal which has both good strength and a high melting point. Additionally, it is a good electrical conductor, has high modulus of elasticity, exceptionally transmit x-rays and sounds at very high velocities. Moreover, it has the ability to…

didn’t cover Sydney Harbour Bridge in zinc, and the process of covering it, takes a lot of hard work and money, people came with another cheaper solution- painting it. Paint effectively ‘seals’ steel from the atmosphere, therefore, prevents it from corrosion. But there is 1 problem with this method- the sun’s light and weather affect the paint in negative way; additionally, it does not protect the exposed steel. This is why, paint layers always get replaced (people remove and repaint Sydney…

The city response to add chlorine to kill the bacteria initially lead to its own suit of problems of which are less discussed. The chlorine reacted with organic matter in the water forming a common class of disinfection byproducts, trihalomethanes (THMs), which are tasteless and odorless known carcinogens (1999). THMs can be taken into the body via drinking and adsorption through the skin (Hood, 2005). Therefore, not only is drinking the water a concern, but now, the water is damaging just to be…