Metal-resin composite and method of preparing the same and shell of electronic product

A method of preparing a metal-resin composite from a metal substrate, wherein the metal includes titanium or titanium alloy, the method comprising:

• etching the metal substrate by dipping the metal substrate in an etching solution to form recesses on a surface of the metal substrate and obtain an after-surface-treatment metal substrate;
• and
• injection molding a resin-containing composition onto the surface of the after-surface-treatment metal substrate to fill the recesses with resin and form a resin layer, wherein:
• the etching solution includes at least one alkali metal hydroxide, an a concentration of an oxygen element on the surface of the after-surface-treatment metal substrate is greater than 1 wt %.

A shell of an electronic product, the shell comprising

• a metal shell body;
• a resin member coated on at least a part of a surface of the metal shell body;
• and
• recesses distributed on the surface of the metal shell body coated with the resin member, wherein the metal shell body is made of titanium or titanium alloy, a part of resin in the resin member fills in the recesses, a concentration of an oxygen element on the surface of the metal shell body coated with the resin member is greater than 1 wt %.