This invention belongs to the field of passivating agent technology, specifically relating to a
corrosion-resistant, high-temperature-resistant,
chromium-free passivating agent for
magnesium alloy workpieces and its preparation method. The
chromium-free passivating agent comprises the following components by weight: 4-5 parts film-forming agent; 8-10 parts functional
acrylic resin; 0.8-1 parts
vanadate; 3-5 parts
coupling agent; 1-2 parts
corrosion inhibitor; and 70-80 parts water. The
chromium-free passivating agent provided by this invention uses
zirconium fluoride and
titanium fluoride as film-forming agents, and is modified by adding functional
acrylic resin, which improves the density and
corrosion resistance of the
passivation film. This results in a chromium-free passivating agent with good corrosion resistance, adhesion, high-
temperature resistance, and antibacterial properties. When used in
magnesium alloy workpieces, it exhibits good corrosion resistance and helps extend the service life of the
magnesium alloy workpieces.