| 摘要 |
A conversion coating for aluminum, ferrous and magnesium alloyed materials includes zirconium, fluoride and calcium ions. The coating is preferably at a pH of between about 2.6 and about 3.1, and may optionally include phosphates, polyphosphates, tannin, boron, zinc and aluminum. A sequestering agent to complex dissolved iron, and a crystal deformation agent such as ATMP are also preferably included.
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