A Brief Introduction to the Ancient Indus Civilization. The greater Indus region was home to the largest of the four ancient urban civilizations of Egypt, Mesopotamia, South Asia and China. It was not discovered until the 1920's. Most of its ruins, even its major cities, remain to be excavated. The ancient Indus Civilization script has not been deciphered.
Anodising to Prevent Galvanic Corrosion. Galvanic corrosion is a serious issue across the engineering industry and it has a variety of solutions, which all boil down to one technique: breaking the circuit.Anodising is one way to break the circuit.The anodic coating is made up of aluminium oxide, which is a good electrical insulator.The oxide layer is a thousand times thicker than the natural oxide that forms on aluminium, which offers essentially no galvanic protection.recautions When Using Anodising for Galvanic Corrosion Protection. Anodised aluminium has an electrically insulative surface, just like any of the other barrier protection techniques and if this surface is damaged then the protection it provides will be reduced or eliminated.
Increased variance of the two metalsâ anodic index cause accelerated corrosion of the more anodic metal. The variance in anodic index can be controlled somewhat through coatings (paint, epoxy, powder coat, etc) and plating (zinc, chrome, etc).The table below provides a generalize guide for predicting the anodic corrosion two dissimilar metals are prone to. The first two numbers indicate the alloy according the the chart below. 2  The last two numbers indicate the amount of carbon in the alloy, where the digits â10â, for example, represent 0.10% carbon. 3  the first two digits indicate this is plain carbon steel.