Aluminum‐tin alloys were electrodeposited onto steel from alkyl benzene,
AlBr3‐normalHBr
electrolytes. Bright, adherent, and coherent aluminum‐tin coatings were obtained at cathode efficiencies approaching 100%. The composition of the cathode deposit can be readily controlled by using Al‐Sn anodes of specified tin content. If the current density, agitation, and specific conductance are maintained constant, the electrolyte tin concentration acquires a constant value after a working up period. With electrolytes having conductivities of
3–6×10−3 Ω−1 cm−1
, 100% of the tin dissolved from the anodes is transferred to the cathode, whereas, with electrolytes having conductivities of
2–3×10−3 Ω−1 cm−1
, only about half the tin content from the anodes is actually electroplated. The codeposition of tin in the electrodeposition of aluminum‐tin alloys was found to be a diffusion rate controlling process.
ChemInform Abstract It is demonstrated that bright, adherent, and coherent Al-Sn coatings on steel can be obtained by electrodeposition from alkyl benzene/AlBr3-HBr electrolytes with cathode efficiencies approaching 100%. The composition of the cathode deposit can be readily controlled by using Al-Sn anodes of specified tin content, if current density, agitation, and specific conductance are maintained constant. TheSn concentration of the electrolyte acquires a constant value after a working up period. 100% of the dissolved Sn from the anodes is transferred to the cathode when electrolytes having conductivities of (3-6)•10-3 ω-1 cm-1 are used, whereas only about half of the tin from the anode is electroplated in electrolytes of lower conductivity. The codeposition of Sn in the electrodeposition of Al-Sn alloys is found to be a diffusion rate controlled process.
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