If this is the new "Copper Quaternary" pressure treated lumber, people might want to know "WHY" it eats fasteners.
They used to treat pressure treated lumber with a mixture of copper and arsenic salts dissolved in water.
The found that the arsenic was being leached out of pressure treated lumber in contact with the ground and showing up in shallow wells people used for their water supply. So, they banned arsenic in pressure treated lumber.
To get the same protection without arsenic, they had to quadruple the amount of copper in the pressure treatment liquid they force into the wood.
Since copper is more noble on the galvanic scale than either zinc or iron, when this new copper quaternary pressure treated wood gets wet, you end up with a lot more galvanic corrosion of zinc plated and unplated iron fasteners than you did with the old arsenic bearing pressure treated lumber.
So, now the recommendation is that people use triple galvanized or stainless steel fasteners and hardware on the new pressure treated lumber to allow for the much higher galvanic corrosion rates cuz of the increased amount of copper.
To make this experiment meaningful, you need to make sure that your pressure treated wood is in contact with the ground or a source of moisture all the time since the corrosion process is primarily galvanic corrosion. You won't get any galvanic corrosion in completely dry wood.