The invention discloses a water-based heavy-duty single-component on-
rust primer, and a preparation method and application thereof. The water-based heavy-duty single-component on-
rust primer is composed of deionized water, a main conversion agent, an auxiliary conversion agent, a penetrant, a film forming assistant, an antifreezing agent, a
preservative, a thickener, a filler, a defoaming agent, a dispersing agent, a pH
regulator, a film forming material and a substrate
wetting agent. The temperature of the used substrate can not be too high, the
humidity can not be greater than 85%, the one-time
spray coating can not be too thick, and the position for electric
welding is reserved. The product is stored at 5-40 DEG C in a ventilating cool dry place, and the construction temperature is preferably 10-40 DEG C. The primer can be applied by
brush coating, roller
coating, air spraying or airless spraying, the particular mode can be selected according to the on-site construction environment and climate conditions, and
brush coating and airless spraying are suggested if conditions permit.