The surface quality and corrosion resistance of hot-rolled AH36 steel plate has always been an important aspect to measure the quality of the steel plate, and the thickness and density of the oxide scale on the surface of the hot-rolled AH36 steel plate are directly related to the corrosion resistance of the AH36 steel plate, which has become an important aspect of the surface quality of the steel plate. important evaluation criteria.
The hot-rolled scale of AH36 steel plate can increase the corrosion potential of the steel, greatly reduce the corrosion current density, and delay the corrosion of the steel matrix. Among them, the cyan scale has better corrosion resistance due to its thicker and denser.
Under the indoor storage conditions with the average temperature and humidity of 23.4℃and 72%, respectively, the cyan oxide scale of AH36 steel plate began to appear a small amount of bubbling after 119 days, and the red oxide scale began to appear obvious red rust after 119 days. After 119 days, the corrosion rate accelerated. potential.
The corrosion thickness loss of AH36 steel plate with oxide scale under indoor storage conditions increases approximately exponentially in the early stage with the passage of time, and increases linearly after the failure of the oxide scale.
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