Advanced Zinc Phosphate Conversion and Pre-Ceramic Polymetallosiloxane Coatings for Corrosion Protection of Steel and Aluminum, and Characteristics of Polyphenyletheretherketone-Based Materials

The characteristics of anhydrous zinc phosphate Zn.Ph coatings deposited by immersing the steel in transition Co, Ni, and Mn cation- incorporated phosphating solutions were investigated. Two important features for the anhydrous 340 deg C-heated Zn.Ph were addressed. One was to determine if the electron trapping behavior of Co2 and Ni2 ions adsorbed in the crystal lattices acts to inhibit the cathodic reaction on the Zn.Ph, and the second was to determine the less susceptibility of the a-Zn3PO42 phase to alkali-induced dissolution. The factors governing the film-forming performance of preceramic polymetallosiloxane PMS coatings for aluminum Al substrate surfaces were investigated. Four factors were important in obtaining a good film 1 the formation of organopolymetallosiloxane at sintering temperatures of 150 deg C 2 the pyrolytic conversion at 350 deg C into an amorphous PMS network structure in which the Si-O-M linkage were moderately enhanced 3 the non- crystalline phases and 4 the formation of interfacial oxane bond between PMS and Al oxide. The formation of well-crystallized polyphenyletheretherketone PEEK in the vicinity of silica aggregates was found in the molted body made in N2. Such a PEEK crystalline structure contributed significantly to the thermal and hydrothermal stabilities of mortar specimens at temperatures up to 200 deg C, and the resistance in 5 wt H2S04 solution at 80 deg C. anhydrous zinc phosphate, steel, corrosion, polymetallosiloxane, aluminum, polyphenyletheretherketone.