Non-toxic corrosion-protection pigments based on rare earth elements

A method of making a corrosion-inhibiting pigment comprising:

• providing a solvent;
• providing a rare earth source in the solvent forming a rare earth solution, wherein
• the rare earth source is selected from a cerium source, a terbium source, a praseodymium source, or a combination thereof, and
• at least one rare earth source is in the tetravalent oxidation state;
• providing a valence stabilizer;
• and
• combining the rare earth source and the valence stabilizer to form a rare earth/valence stabilizer complex.

A method for treating a surface for corrosion resistance, comprising:

• providing a substrate to be coated;
• and
• applying a corrosion-inhibiting pigment comprising a rare earth source and a valence stabilizer combined to form a rare earth/valence stabilizer complex, wherein
• the rare earth source is selected from a cerium source, a terbium source, a praseodymium source, or a combination thereof, and
• at least one rare earth source is in the tetravalent oxidation state.

A method of making a corrosion-inhibiting pigment comprising:

• providing a solvent;
• providing a rare earth source in the solvent forming a rare earth solution, wherein
• the rare earth source is selected from a cerium source, a terbium source, a praseodymium source, or a combination thereof, and
• at least one rare earth source is in the tetravalent oxidation state;
• providing a valence stabilizer;
• and
• combining the rare earth source and the valence stabilizer to form a rare earth/valence stabilizer complex, wherein the rare earth/valence stabilizer complex is sparingly soluble in water at about 25° C. and about 760 Torr.

A method for treating a surface for corrosion resistance, comprising:

• providing a substrate to be coated;
• and
• applying a corrosion-inhibiting pigment comprising a rare earth source and a valence stabilizer combined to form a rare earth/valence stabilizer complex, wherein
• the rare earth source is selected from a cerium source, a terbium source, a praseodymium source, or a combination thereof,
• at least one rare earth source is in the tetravalent oxidation state, and
• the rare earth/valence stabilizer complex is sparingly soluble in water at about 25° C. and about 760 Torr.