Chemistry chemical bonding [closed]








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when a chemical bond is formed, does chemical reaction occur? if i have done a coating on metal substrate then how does it adhere to the substrate? If there is a chemical bond then which reaction does takes place?




If a chemical bond between atoms is split, or newly generated, than there is occurrence of a chemical reaction. Not all bonds, however, are equal -- covalent bonds differ from hydrogen bonds, for example.


Your question *may* be interpreted as if you were unsure to discern between [physisorption](https://en.wikipedia.org/wiki/Physisorption), the more general, more frequently mechanism of [adsorption](https://en.wikipedia.org/wiki/Adsorption), and [chemisorption](https://en.wikipedia.org/wiki/Chemisorption) -- where actual bonds between substrate and coating are formed (yet: not necessarily the same bonds in terms of strength as C-C in an alkyl chain, for example). If so, look at [self assembled monolayers](https://en.wikipedia.org/wiki/Self-assembled_monolayer) -- it may shed some light on the matter.


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It actually depends about which type of coating you are talking about. Lets say for electroplating a metal with copper, its just a redox reaction which happening inbetween the chosen electrolyte and the metal which is taken at anode i.e. copper. Here after copper oxidises to cu2+ , then goes towards cathode to be reduced and get deposited over your desired metal which is required to be electroplated. But there is no such bond formation between the copper and the metal over which copper is being deposited. ***It is kind of an interlocking within the roughened surface and also it is because cohesive forces between the metal atoms***.


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