Non-Galvanically Applied Nickel Alloy

Abstract

Lead-free nickel phosphorus dispersion alloy present on a metallic substrate surface, obtainable by electroless deposition in an electrolyte which contains 4 to 7 g/l of nickel ions; 15 to 40 g/l of hypophosphite; at least one stabiliser; 5 to 400 mg/l of an alkylaryl oxydialkyl benzyl ammonium chloride or a partially fluorinated betaine; 50 to 60 g/l of a carboxylic acid-containing complexing agent A; 5 to 40 g/l of a carboxylic acid-containing complexing agent B different from A; 4 to 10 g/l of dispersed particles which differ from the composition of the nickel/phosphorus alloy; and contains no boric acid or borates, and articles coated therewith.

1 . Lead-free nickel phosphorus dispersion alloy present on a metallic substrate surface, obtainable by electroless deposition m an electrolyte containing
 4 to 7 g/l of nickel ions;   15 to 40 g/l of hypophosphite;   at least one stabiliser;   5 to 400 mg/l of an alkylaryl oxydialkyl benzyl ammonium chloride or a partially fluorinated betaine;   50 to 60 g/l of a complexing agent A containing carboxylic acid;   5 to 40 g/l of a complexing agent B different from A containing carboxylic acid;   4 to 10 g/l of dispersed particles which differ from the composition of the nickel/phosphorus alloy; and   no boric acid or borates   the data relating to the composition of the electrolyte as a whole.   
     
     
         2 . Nickel alloy according to  claim 1  characterised in that the electrolyte contains, as stabiliser, at least 10 mg/l of antimony ions and maximum 1.5 mg/l of bismuth ions. 
     
     
         3 . Nickel alloy according to  claim 2  characterised in that the electrolyte contains, as stabiliser, 10-150 mg/l of antimony ions and 0.01-0.5 mg/l of bismuth ions. 
     
     
         4 . Nickel alloy according to  claim 1  characterised in that the electrolyte additionally contains a non-ionic surfactant. 
     
     
         5 . Nickel alloy according to  claim 4  characterised in that the non-ionic surfactant is selected from the group of partially fluorinated or non-fluorinated surfactants. 
     
     
         6 . Nickel alloy according to  claim 1  characterised in that the particles are selected from, the group of silicon carbide, corundum, diamond, cubic boron nitride, spherical aluminium oxide and boron tetracarbide. 
     
     
         7 . Nickel alloy according to  claim 1  characterised in that the particles are non-metallic and exhibit a hardness of more than 1,000 HV. 
     
     
         8 . Nickel alloy according to  claim 1  characterised in that the particles exhibit friction-reducing properties and are selected from the group of polytetrafluoroethylene, molybdenum, sulphide, molybdenum disulphide, hexagonal boron nitride, tin sulphide and graphite. 
     
     
         9 . Use of a nickel alloy according to  claim 1  as wear-resistant surface, in particular in the motor vehicle industry and in engineering, particularly preferably as parts of locks for door closure systems and functional components for fuel metering systems or as surface in the motor vehicle industry with improved sliding friction properties, in particular for parts of locks, valves, rotary ducts, valve anchors, moveable pistons and other moveable parts in the motor vehicle industry and in engineering. 
     
     
         10 . Nickel alloy according to  claim 2  characterised in that the particles exhibit friction-reducing properties and are selected from the group of polytetrafluoroethylene, molybdenum sulphide, molybdenum, disulphide, hexagonal boron nitride, tin sulphide and graphite. 
     
     
         11 . Nickel alloy according to  claim 3  characterised in that the particles exhibit friction-reducing properties and are selected from the group of polytetrafluoroethylene, molybdenum sulphide, molybdenum disulphide, hexagonal boron nitride, tin, sulphide and graphite. 
     
     
         12 . Nickel alloy according to  claim 4  characterised in that the particles exhibit friction-reducing properties and are selected from the group of polytetrafluoroethylene, molybdenum sulphide, molybdenum disulphide, hexagonal boron nitride, tin sulphide and graphite. 
     
     
         13 . Nickel alloy according to  claim 5  characterised in that the particles exhibit friction-reducing properties and are selected from the group of polytetrafluoroethylene, molybdenum sulphide, molybdenum disulphide, hexagonal boron nitride, tin sulphide and graphite. 
     
     
         14 . Nickel alloy according to  claim 6  characterised in that the particles exhibit friction-reducing properties and are selected from the group of polytetrafluoroethylene, molybdenum sulphide, molybdenum disulphide, hexagonal boron nitride, tin sulphide and graphite. 
     
     
         15 . Use of a nickel alloy according to  claim 2  as wear-resistant surface, in particular in the motor vehicle industry and in engineering, particularly preferably as parts of locks for door closure systems and functional components for fuel metering systems or as surface in the motor vehicle industry with improved sliding friction properties, in particular for parts of locks, valves, rotary ducts, valve anchors, moveable pistons and other moveable parts in the motor vehicle industry and in engineering. 
     
     
         16 . Use of a nickel alloy according to  claim 3  as wear-resistant surface, in particular in the motor vehicle industry and in engineering, particularly preferably as parts of locks for door closure systems and functional components for fuel metering, systems or as surface in the motor vehicle industry with improved sliding friction properties, in particular for parts of locks, valves, rotary ducts, valve anchors, moveable pistons and other moveable parts in the motor vehicle industry and in engineering. 
     
     
         17 . Use of a nickel alloy according to  claim 4  as wear-resistant surface, in particular in the motor vehicle industry and in engineering, particularly preferably as parts of locks for door closure systems and functional components for fuel metering systems or as surface in the motor vehicle industry with improved sliding friction properties, in particular for parts of locks, valves, rotary ducts, valve anchors, moveable pistons and other moveable parts in the motor vehicle industry and in engineering. 
     
     
         18 . Use of a nickel alloy according to  claim 5  as wear-resistant surface, in particular in the motor vehicle industry and in engineering, particularly preferably as parts of locks for door closure systems and functional components for fuel metering systems or as surface in the motor vehicle industry with improved sliding friction properties, in particular for parts of locks, valves, rotary duets, valve anchors, moveable pistons and other moveable parts in the motor vehicle industry and in engineering. 
     
     
         19 . Use of a nickel alloy according to  claim 6  as wear-resistant surface, in particular in the motor vehicle industry and in engineering, particularly preferably as parts of locks for door closure systems and functional components for fuel metering systems or as surface in the motor vehicle industry with improved sliding friction properties, in particular for parts of locks, valves, rotary ducts, valve anchors, moveable pistons and other moveable parts in the motor vehicle industry and in engineering. 
     
     
         20 . Use of a nickel alloy according to  claim 7  as wear-resistant surface, in particular in the motor vehicle industry and in engineering, particularly preferably as parts of locks for door closure systems and functional components for feel metering systems or as surface in the motor vehicle industry with improved sliding friction properties, in particular for parts of locks, valves, rotary duels, valve anchors, moveable pistons and other moveable parts in the motor vehicle industry and in engineering. 
     
     
         21 . Use of a nickel alloy according to  claim 8  as wear-resistant surface, in particular in the motor vehicle industry and in engineering, particularly preferably as parts of locks for door closure systems and functional components for fuel metering systems or as surface in the motor vehicle industry with improved sliding friction properties, in particular for parts of locks, valves, rotary ducts, valve anchors, moveable pistons and other moveable parts in the motor vehicle industry and in engineering.