An electrolytic sulfurization at room temperature has been introduced in the present work,
which process parameters are optimized to the quenched Cr12 substrate. Morphology and
microstructure of the sulfide layers are investigated deeply, and their formation mechanism is discussed
in detailed. According to optimum parameter of sulfurizing process ( assistant current density of
1.8A/dm2, the saturated rare-earth-halide solution containing 300g Na2S2O3, 60g KHSO3 and 1000ml
H2O, 298K/20~40min), the ferrous sulfide coating was easily obtained on the quenched Cr12 substrate
with a uniform thickness of above 10μm, no matter about the treated parts with the complex
geometrical shapes. The tribological experiment results of a block-on-ring tribometer indicate that the
sulfide coatings on hard substrate have a very low friction coefficient and could obviously reduce the
wear extent of its counterpart. Compared with the traditional low-temperature process, this sulfurizing
technology has such virtues as simple process, heatless, low cost, little deformation, without pollution
question, etc., which could be employed for industrial solid lubricant due to the good friction-reducing
characteristic of lamellar-structure FeS phase.
Facile all-dip-coating deposition of highly efficient (CH3)3NPbI3−xClx perovskite materials from aqueous non-halide lead precursor