Studiengesellschaft Kohle Mbh

Klaus-Dieter Mehler

Herbert Lehmkuhl

Bertram Reinhold

Organoaluminum electrolytes and methods for the coating of electrically conductive materials with aluminum or aluminum-magnesium alloys, essentially and preferably consisting of Na&lsqb;Et Al&mdash;H&mdash;AlEt &rsqb; for aluminum coating, or of either K&lsqb;AlEt &rsqb; or Na&lsqb;Et Al&mdash;H&mdash;AlEt &rsqb; and Na&lsqb;AlEt &rsqb; and trialkylaluminum for alloy coating using solutions of these electrolytes in liquid aromatic hydrocarbons or mixtures thereof with aliphatic mono- or polybasic ethers, such as dimethoxyethane, and using soluble anodes of aluminum or of aluminum and magnesium, or of aluminum-magnesium alloy.

Aluminum organic electrolytes and method for electrolytic coating with aluminum or aluminum-magnesium-alloys

The invention relates to organoaluminum electrotyles for the electrolytic deposition of aluminum which are characterized in that they consist of KF . 2 AlEt.sub.3 (A), KF . 2 AlMe.sub.3 (B) and MF . 2 Al(iBu).sub.3 (C), wherein M=sodium or potassium or a mixture of both, in a molar ratio of A:B:C of from 2:1:1 to 7:1:1. The organoaluminum electrolytes are dissolved in from 2 to 4.5 moles, based on the amount of MF employed, of an aromatic hydrocarbon which is liquid at 0.degree. C. The invention further relates to a process for the electrolytic deposition of aluminum on electrically conductive materials by using said electrolytes.

Organoaluminum electrolytes and process for the electrolytic deposition

The invention relates to organoaluminum electrolytes for the electrolytic deposition of high-purity aluminum, which are characterized in that they contain mixtures of organoaluminum complex compounds of the type MF.2 AlR.sub.3 (A), wherein M represents potassium or mixtures of K with a maximum of about 15% by mole of sodium, as well as trialkylaluminum AlR.sub.3 (B) which has not been complexed to an alkali metal fluoride in a molar ratio of A:B of from 4:0.6 to 4:2, as well as a polyfunctional Lewis base of the type R'-OCH.sub.2 CH.sub.2 -OR' (C) in a molar ratio of B:C of from 1:0.5 to 1:1. The organyl radicals R in A are ethyl groups (Et), methyl groups (Me) and iso-butyl groups (iBu) in a molar ratio of Et:Me:iBu as 3:m:n, wherein m and n are numerical values of between 1.1 and 0 and the sum (m+n) is from 0.75 to 1.4. As the solvent for said electrolytes there are used from 3 to 4.5 moles, relative to the amount of alkali metal fluoride employed, of an aromatic hydrocarbon which is liquid at 0.degree. C. or a mixture of such hydrocarbons. The invention further relates to a process for the electrolytic deposition of high-purity aluminum by using said electrolytes.

Organoaluminum electrolytes for the electrolytic deposition of

Disclosed are electrolytes and processes for the metal-plating of metallic materials, and more specifically low-alloy high-strength steels, which processes are characterized in that adhesion-bonding layers of iron, iron and nickel, nickel, cobalt, copper or alloys of said metals or Sn-Ni alloys are electrodeposited on said metallic materials from non-aqueous electrolytes, and then aluminum is electrodeposited thereon in a per se known manner.

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Mulheim/Ruhr, Germany

Klaus-Dieter Mehler