Advantages And Disadvantages Of Steel Pickling
• For sulphuric acid the same waster acid can be renewed again. This is because the dissolved ion salts are removed or extracted from the spent acids which can be reused again as form of pickle liquor that will lead to a sustained method of innovating ways of pickling various metals.
• Raising the specific temperature will allow lower acid concentrations to pickle effectively. Since sulphuric acid is commonly used it is also less efficient than hydrogen however its temperature can be controlled by increasing or decreasing.
• Sulfuric acid is commonly used for steel pickling due to its low and efficient price. It is commonly used as it has low vapour pressure which is good as when temperatures rise it boils the sulphuric acid leading to a release
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Some materials get rust due to the combination of oxygen and water. They form a layer called oxide which is a brownish-red layer that is formed by a chemical reaction.
This image shows the process of galvanising Cons: In some cases pickling may degrade or loose the physical properties of steel. This is because there is a chemical reaction between the metallic iron and the hydrogen is generated. This causes the level of hydrogen to increase which will then be accumulated to the steel itself causing hydrogen embrittlement which is also known as the diffusion of hydrogen in the steel making it light and brittle.
• As good as the pickling is to the metal it is as bad as the effects it has on the environment. Proper ventilation, mist discharge, sewage are all environmental effects.
• For sulphuric acid the “not-pickled” metal needs few cracks on the scale layer covering the base metal so that the sulphuric acid can be entered beneath the scale to loosen the bond between the scale and the base metal. However sulphuric acid can be diffused against the base metal
Other acids that can be used is Hydrochloric acid as an
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