Mtu Motoren-Und Turbinen-Union Muenchen, Gmbh

Mtu Motoren-Und Turbinen-Union

Bl Produktions Gmbh

Paul Buenger

Martin Thoma

Willi Buchecker

Manfred Hiermaier

Josef Linska

Monika Bindl

Work pieces to be galvanically coated or plated are held in place with a good electrical contact by a holding device having an electrically conducting hollow carrier (2), a magnet (3) removably mounted inside said hollow carrier (2) the ends of which are closable for protection of the magnet in a galvanic bath. A cover (4), with receptacles (28) or bore holes in which the work pieces or parts (12) are received, is clamped to the carrier (2) by a releasable clamping device (5). The magnet (3) is arranged alongside a contact surface (19) through which the magnet holds the parts (12), since the pole axis (P) of the magnet (3) extends perpendicularly to the contact surface (19) which may be formed by a machined surface of a carrier wall or by an electrically conducting ferromagnetic plate secured to the carrier.

Holding and contacting apparatus for galvanically coating work pieces

A galvanizing magazine has electrically conducting electrodes for holding a multitude of small parts in positions that assure uniform coating conditions for all parts held in any of electrodes held in the magazine. A hollow cylindrical electrode with slots therein forms the magazine, or a plurality of rod electrodes held in a current distributing disk at one end and in a mounting disk at the other end form the magazine. The electrodes have receptacles so that each receptacle holds one small part in such a way that the longitudinal axis of the small part and the central axis of the receptacle extend at a right angle and radially to a rotational axis of the magazine. The receptacles are uniformly spaced from each other in a row along a respective electrode and also uniformly spaced with angular spacings in the circumferential direction around the longitudinal rotational axis of the magazine. Thus, the part surfaces to be plated face radially outwardly while the part itself is held in a fixed position with an electrical contact between the part and the electrode. This construction assures a consistently reproducible and controllable coating quality, even for large numbers of small parts. Such a magazine is easily loaded and unloaded in an automatic manner.

Galvanizing magazine for coating work pieces

Galvanically or electrolytically deposited protective coatings are produced on structural components such as gas turbine blades by suspending in the electrolytic solution a metal alloy powder of which the particles have a spherical configuration and a passivated surface. The concentration of the particles in the electrolyte is preferably smaller than 100 g/l, whereby a high insertion rate of up to 45% by volume has been achieved at relatively low costs and small technical efforts.

Method for producing a galvanically deposited protection layer against

A bath or electrolyte for the galvanic deposition of a metal matrix layer having embedded therein particles of a non-metallic substance, comprises a stabilizer for keeping such non-metallic substances uniformly suspended in the bath for the duration of the electrolysis. The suspension stabilizer is a cation active imidazole derivative satisfying the general formula ##STR1## wherein R.sup.1 is preferably a monovalent, saturated or unsaturated hydrocarbon radical having at least four aliphatically bound C-atoms, R.sup.2 is a methylene (carbene), or ethylene, or propylene or isopropylene group, and wherein X is selected from --NH.sub.2, --NHR.sup.3, --NR.sup.3 R.sup.4, --OH, or OR.sup.5, whereby R.sup.3, R.sup.4 and R.sup.5 are methyl, ethyl, or propyl or polyglycolether radicals having up to five --O--CH.sub.2 --CH.sub.2 groups.

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Munich, Germany

Paul Buenger