8/5/2023 0 Comments Will zinc rust outside![]() ![]() Some smart thinking will also allow you to avoid the risk of corrosion in the metallic combination aluminium and galvanized steel. Replacing electroplated steel with hot dip galvanized steel Another way to obtain cathodic protection is to connect the aluminium object to the negative pole of an exterior DC voltage source. By doing this, you sacrifice the less noble material – it corrodes – for the aluminium. The most common way to do this is to mount an anode of a less noble material (often zinc) in direct metallic contact with the aluminium object to be protected. You can also use an insulating layer between the metals. I suggest coating the cathode surface, i.e. Where insulation is difficult, in large constructions for example, an alternative solution is to keep an electrolytic bridge from forming between the metals. The insulation needs to break all contact between the metals. You electrically insulate the metals from each other. Here are three ways you can prevent galvanic corrosion through improved design: ![]() I started off by saying that too little focus on galvanic corrosion can cause a design to become very poor, and showed how galvanic corrosion can occur. Where aluminium is in contact with a more noble metal, and there is water, then there will be corrosion.Įlectrical insulation and cathodic protection In other words, the risk of galvanic corrosion in aluminium must always be considered in environments with high chloride levels, such as areas bordering the sea.
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