Manufacturing method of aluminum-based alloy plated steel

A method of manufacturing an aluminum-based alloy plated steel having excellent corrosion resistance, comprising:

• preparing a base steel comprising, by wt %, 0.18 to 0.25% of C, 0.1 to 0.5% of Si, 0.9 to 1.5% of Mn, 0.03% or less of P, 0.01% or less of S, 0.01 to 0.05% of Al, 0.01 to 0.5% of Cr, 0.01 to 0.05% of Ti, 0.001 to 0.005% of B, 0.009% or less of N, and a balance of Fe and inevitable impurities;
• plating the prepared base steel by submerging the base steel in a hot-dip aluminum plating bath;
• cooling the plated based steel at 3 to 25° C./s and manufacturing an aluminum-based plated steel having an Al-based plated layer;
• heating the aluminum-based plated steel at 800 to 1000° C. for 3 to 20 minutes, where a change of the heating rate at a temperature range of 600 to 700° C. is 0.05° C./s2 or less in absolute value;
• and
• rapidly cooling the heated aluminum-based plated steel.