Effect of Silica Fume Content on the Corrosion Resistance of Inorganic Phosphate Coatings
In order to enhance the corrosion resistance of potassium magnesium phosphate cement(MKPC)coatings were modified by adding four different silica fume contents of 5％,10％,15％and 20％magnesium oxide.The physical and chemical characterization parameters such as Vickers hardness,flexural compressive strength and bond strength were tested,and the electrochemical impedance spectrum and mid-term salt spray test coating corrosion resistance under the condition of room temperature curing ability.The results show that the corrosion resistance of potassium magnesium phosphate cement-based steel structure anticorrosive coating is the best after adding 20％silica fume,which is 480％higher than that of the blank group.The anti-corrosion coating was coated on the surface of Q235 steel.After 28 days of immersion in 3.5％sodium chloride solution,after 1440h neutral salt spray corrosion test,there was no corrosion on the surface of Q235 steel coating.
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