Influence of picoseconds laser irradiation on the properties of black chromium obtained in a trivalent chromium bath

ABSTRACT

In this work the influence of picosecond laser (ps) irradiation (PLI) on the properties of black Cr electrodeposited on an SS substrate has been investigated. XPS has shown that black Cr treatment by PLI changes the concentrations of elements on the black Cr coating surface. Furthermore, it diminishes the quantity of CrN compound, while increasing the quantity of metallic chromium (Cr^o). Full reflectance (RD) of black Cr after treatment with PLI and before treatment in the visible region (300–800 nm) were quite close. Thermal tests at a temperature of 200 ^oC showed that the adhesion between black Cr treated with PLI and SS is better than that of black chromium not treated with PLI. Thus, such a black Cr absorber may be used in solar water heaters.

GRAPHICAL ABSTRACT

KEYWORDS:

• Black Cr
• electrodeposition
• laser texturing
• morphology
• optical properties
• adhesion

Disclosure statement

No potential conflict of interest was reported by the author(s).