Should I take time to clean my circular saw blade after cutting pressure treated lumber? Since fasteners other than stainless steel or galvanized can corrode when used in pressure treated wood, is it going to cause my blade to corrode? Or is it only prolonged exposure?
Wood – Can cutting pressure treated wood harm the saw blade
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It's pressure-treated just under a different process that is "greener". See the PDF here. If it's treated, then there are preservatives in the wood to prevent rot and as an insect-repellant.
You could probably rent a saw like this from your local hardware store.
They will usually have a diamond tipped masonry blade. You'll also want to make sure it's a wet saw or you keep the stones wet as you cut, as the dust from cutting concrete can make a real mess and be harmful to your health.
You may also be able to find a splitter like this.
The splitters produce far less dust and noise, and can usually be found cheaper than a saw (I found a couple on-line for a few hundred dollars). However, splitters may not produce a perfectly clean cut. Splitters also come in pneumatic and hydraulic varieties, purchasing those might be out of the budget ($1000.00 and up) but might be available for rent at a reasonable price.
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Best Answer
You have to cut the wood somehow... You can give your blades a wipedown with a slightly damp rag to remove sawdust particles (let them air-dry well afterward), but I wouldn't worry too much.
Corrosion involving PT lumber is mostly a problem with long-term contact; the copper compounds in the chemical treatment are more "galvanically noble" than many common metals including carbon steel, and so an electrochemical reaction will result in the less noble metal (here the steel or iron) oxidizing. The same happens with ordinary zinc-coated or uncoated iron or steel fasteners in PT construction. To prevent this, stainless steel alloys (containing low carbon and higher concentrations of even nobler metals like chrome and nickel) or hot-dip galvanized fasteners (which cover the steel with a thick protective coating of zinc oxide which shields the fastener against further corrosion), are recommended for long-term contact with pressure-treated wood (on the scale of years).
However, your carbon-steel/carbide saw blade will only be in contact with the wood and its chemicals for some seconds. Your saw blades will dull naturally through age and use before the chemicals have any detectable effect.