an aqueous inkjet printing fluid composition for use in an inkjet printer comprising a silicon - based material which contacts the aqueous printing fluid composition , comprising in a concentration sufficient to inhibit corrosion of the silicon - based material when contacted by the aqueous printing fluid composition a soluble metal ligand complex of formula : wherein m represents a divalent or a trivalent metal , r 1 and r 2 each independently represent alkyl , aryl , or heteroaryl substituents , r 3 represents hydrogen , a halide , or an alkyl , aryl , or heteroaryl substituent , and the number of ligands n is 2 or 3 . the useful lifetime of microelectromechanical fluidic devices based on silicon fabrication is extended .