Method for manufacturing zinc alloy plated steel material having excellent surface quality and corrosion resistance

A method of manufacturing a zinc alloy plated steel material having excellent surface quality and corrosion resistance, comprising:

• preparing a base steel material;
• immersing the base steel material into a zinc alloy plating bath containing Mg and Al to plate the base steel material;
• and
• wiping the plated base steel material, and then cooling,
• wherein the cooling satisfies the following relationship 1,
• wherein the plating and wiping satisfy a working index of 0.5 to 40 represented by the following relationship 2:
• 0.7Vc≤Vc′≤1.5Vc [Relationship1]
• where Vc is an average cooling rate until end of solidification of a plating layer immediately after wiping, and Vc′ is an average cooling rate until start of solidification of the plating layer immediately after wiping,
• Working
• ⁢
• ⁢
• index
• =
• {
• (
• P
• D
• )
• *
• t
• }
• S
• *
• (
• T
• -
• 4
• ⁢
• 0
• ⁢
• 0
• )
• [
• Relationship
• ⁢
• ⁢
• 2
• ]
• where P denotes a pressure of a wiping gas (KPa), D denotes a distance between the wiping nozzle and a plated steel material (mm), t denotes a slot thickness of the wiping nozzle (mm), S denotes a velocity of passing of the steel material (meters per minute, MPM), and T denotes a temperature of the plating bath (° C.).