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GLOSSARY

105Reference of film-forming varnish Finigard 105 which brings resistance to erosion and improves friction coefficient.
200Reference of film-forming varnish Finigard 200 which brings resistance to corrosion and thermal shock.
320Basic version of Dacromet, made using zinc and aluminium.
500Geomet containing PTFE to improve the friction coefficient of the coated part.
Acid zincElectrolytic galvanising for which the galvanising bath has a pH of around 4.
AdherisationTechnique consisting in making rubber adhere to a metallic part.
Alkaline zincElectrolytic galvanising for which the galvanising bath has a pH of around 12.
AlumininiumMetal used in flake coatings in order to improve the resistance to corrosion of the part.
AmorphousSimple type of phosphatisation mainly used in pre-paint preparation.
AnodeMetal part with a positive charge, submerged in an electrolytic bath on which the sacrificial metal is fixed.
Anti-corrosionCoating protecting metal against corrosion.
AqueousProduct made using water.
BarrelRectangular basket into which the parts to be coated with Dacromet are placed, loose.
BarrelProcessing basket used during wet coating (galvanising, phosphatisation...).
BathContainer for processing products.
BichromatedPassivation of a yellow-green-reddish colour applied to an electroplate.
Black passivationBlack passivation applied to an electroplate.
BonderisingPhosphatisation process.
BonderlubeDry lubricant wax applied to a finished coating or to stainless steel, which improves its friction coefficient.
BondingPhenomenon allowing improved adherence of a coating to the original metal.
CalciumCrystalline phospatisation, otherwise known as calcium phosphatisation, which aims at improving the adherence of rubber to steel (adherisation).
CathodeMetal part with a negative charge, submerged in an electrolytic bath on which the part to be coated is fixed.
CentrifugationSpin drying method which allows surplus product to be removed by spinning a barrel containing the parts on its own axis.
ChromatesElement derived from chrome which provides an excellent resistance to corrosion, in complement to a sacrificial coating.
ChromatisationOperation aiming to add chromates to a sacrificial coating as a whole, or to its surface.
ChromeShiny metal which significantly improves a coating’s resistance to erosion.
ChromicChromic passivation is used to improve the resistance to corrosion of amorphous passivation.
Closed circuitDefines an installation which does not directly expel any product.
ColourationFact of completely covering a metallic part with a uniform colour (not to be confused with referencing).
ConveyorBelt mechanism used in painting or Dacromet to which the parts to be coated are attached.
CorrosionNatural evolution of a metal during which it returns to its natural oxidous state.
CoslettisationPhosphatisation process.
CristallineDeveloped type of phospatisation which confers properties of adherence, deformation without the use of heat, anti-corrosion, improvement of friction, bonding with primary metal, depending on the type of phosphatisation used (zinc, calcium, manganese).
CrucibleRecipient in which metal is fused; zinc bath for hot galvanisation.
CupreousMetal containing copper: bronze, brass...
DacrokoteBlack coating, applied over Dacromet, loose or on a rack, bringing a black colour, and an improvement in the friction coefficient and in resistance to corrosion.
DacrolubDry lubricant wax applied to a finished coating or to stainless steel, which improves the friction coefficient of the part.
DacrometTough anti-corrosion flake coating made using zinc and aluminium.
DegreasingPreparation stage where grease is removed from a part.
Dipped centrifugedApplication of Dacromet on loose parts consisting in plunging the parts into the Dacromet and then removing excess coating by centrifugation.
DuclanisationSpecific chemical method of applying tin to cupreous metals.
DuplexPhosphatisation process.
ElectrolysisApplication of metals by passing a low voltage electrical current through the part to be coated.
ElectroplatingApplication of metals by passing a low voltage electrical current through the part to be coated.
ElectroplatingTerm defining the application of metals using electrolysis.
ElectrostaticHigh voltage current used to attract paint or Dacromet towards the part to be coated: the part is grounded (-) and the coating charged with static electricity. Hence the coating is attracted to the part.
EpoxyType of paint, made using epoxy resin, which is very resistant to extreme climatic conditions.
Film-formingIs said of a varnish (Finigard for example) which creates a protective film over a part in order to improve its resistance to corrosion and thermal shocks or its friction coefficient.
FinigardFilm-forming varnish which creates a protective film over a part in order to improve its resistance to corrosion and thermal shock or its friction coefficient.
FinishFinal layer of product applied over a finished coating.
FinishingEffect of including hydrogen in a part, which is inherent to the process of electrolytic coating. The resulting fragility is eliminated by hydrogen extraction.
Flake coatingLatest type of coating which is applied by plating and then heating. The coating is called flake because the material is present in microscopic superimposed flakes. This family of coatings includes Dacromet™, Zintek™, and Delta-Tone™.
FosbondGalvanising process.
Friction coefficientCoefficient measuring the sliding of two materials against each other. Generally used for measuring the sliding of a screw or a bolt. The lower it is, the lower the resistance to friction of the material.
FusionPassage of a metal from a solid to a liquid state.
GalvanisingAct of galvanising. Not to be confused with electroplating.
GalvanisingElectrolytic application of zinc.
GradeTerm defining the weight of Dacromet per square metre with which a part is plated.
Grade AWeight of a layer of Dacromet coating with which a part is plated of a minimum of 24 grams per square metre.
GranodisingPhosphatisation process.
Green passivationPassivation of an olive-green colour with a blueish tinge, applied to an electroplate.
Heat treatmentOperation aiming to modify the mechanical properties of a metal. Heat treatment operates directly on the metal.
HydrogenElement which penetrates the metal during electrolytic coating and renders the part more fragile. The resulting fragility is eliminated by hydrogen extraction.
Hydrogen extractionMethod consisting in the removal of hydrogen from a part by leaving it in an oven at 200°c for at least 2 hours.
InductionModern method of heating using magnetism.
ISOInternational standards organisation - worldwide organisation which defines regulation quality standards within companies.
JammingPhenomenon whereby two moving metal parts stick together, caused by micro welding. This can be reduced by parts being subjected to manganese phosphatisation.
KesternichDestructive test measuring the number of cycles a part can stand up to when placed within a chamber where it is sprayed with an acid solution.
Lifting deviceMounting used in hot-dip galvanising, on which the parts to be processed are hung.
Liquid penetrant testingLast phase of thermal processing which defines the metal’s properties.
Loose (barrel)Method consisting in coating a group of parts placed together inside one basket or barrel.
LubricationOperation aiming to allow the part to slide. Lubrication may be dry (Bonderlube, Dacrolub, PTFE, Techseal...) or wet (oiling...).
ManaganeseCrystalline phosphatisation, also known as manganese phosphatisation, which aims at improving the resistance to corrosion and the friction properties of a part.
MarblingUnsightly and non-uniform appearance following galvanising, due to the steel used not being suited to hot-dip galvanising.
Micro bead blastingDry stripping operation where the surface of parts is blasted with micro beads of steel or glass in order to strip it of rust.
Micron (µm)Represents a thousandth of a millimetre (micrometre)
NickelMetal with exceptional anti-corrosion characteristics which can be applied pure or as an alloy (zinc-nickel) in order to improve the anti-corrosion performance of zinc.
OilingOperation consisting in plunging parts into a bath of oil, carried out after phosphatisation, in order to improve the basic phospatisation properties.
OrganicIs said of a product made using carbon atoms and their derivatives.
PaintDecorative anti-corrosion coating, based on epoxy or polyester resins, in powder form.
ParcolubritePhosphatisation process.
ParkerisationPhosphatisation process.
PassivationNatural tendency of a metal to produce a layer of oxides on its surface when it comes into contact with oxygen. Also defines coatings applied after an electroplate (white, bichromate, black, olive green).*
PhosphateLayer of phosphate acid salts.
PhosphatexPhosphatisation process.
PhosphatisationAnti-corrosion coating made using phosphoric acid salts. Variations include zinc, manganese, and calcium phosphatisation.
Phosphoric acidType of acid used in the make up of a phosphatisation bath.
PicklingPhosphatisation process.
PiercingIndispensable stage when preparing a part for galvanising: to be carried out by the customer, consisting in piercing the part in order to allow the processing liquids to circulate effectively.
Point effectThe point effect describes the tendency of an electrolytic coating to adhere primarily to protruding areas of a part rather than to hollow ones.
PolyesterType of paint, made using polyester resin, suited to indoor use.
PolymerisationPhenomenon whereby paint is transformed using energy.
PolyzincFirst layer of anti-corrosive bonding paint, used as a primer for powder paint.
PreparationOperation carried out prior to any coating of a surface with the aim of removing all traces of oil and rust from the part in order to obtain efficient bonding of the plated coating.
PrimerProduct which improves adherence of paint to a part and its resistance to corrosion.
ProcessingDefines a type of anti-corrosion, decorative or other coating, applied to a part.
Programmable logic controller (PLC)Electronic system which manages a machine automatically, according to how it has been programmed.
PTFEPolytetrafluorethylene (PTFE) is a high molecular weight polymer used to improve the friction coefficient of the coated parts.
PulverisationMethod of application used for Dacromet rack or paint aiming to spray fine particles of coating over the part using electrostatic spray guns.
QualityProcess by which a client is supplied with a service corresponding to their request.
Rack (adjective)Defines a wet process carried out using a rack.
Rack (noun)Metal frame to which parts passing through a wet rack process (galvanisation, phosphatisation...) are attached.
Rack (to)Method consisting in coating parts which have previously been attached one by one to a rack which is submerged into wet processing baths (galvanisation, phospatisation...).
Red rustOxidisation of a material containing iron.
ReferencingApplication of a layer of coloured paint to parts in order to distinguish two very similar ones.
SacrificialCoating of which the metal component will oxidise before the metal of the part to which it is applied. For example: zinc on steel because the zinc will rust or ‘sacrifice’ itself before the steel. This is why zinc prevents steel to which it is applied from rusting.
Salt sprayDestructive test measuring the amount of time (in hours) before white rust and red rust appear on a part when it is placed within a chamber where it is sprayed with hot salt water.
SavingTechnique which allows certain parts of a part to remain uncoated.
Scotch-tape testTest measuring the adherence of Dacromet to the primary metal by attempting its removal using adhesive tape.
SealerA layer which is part of the Tricoat system, allowing Techseal to bond with the sacrificial primer.
Socket screwScrew on which the recess is not external but incorporated into the body of the screw (Torx, Allen...).
SpangleUniform, shiny appearance of hot-dip galvanising.
SpecificationsContractual document describing the demands of a customer concerning the product they require.
StrippingPreparation stage where rust is removed from a part.
Surface treatmentOperation aiming at modifying the surface properties of a metal. Surface processing, contrary to heat processing, does not modify the mechanical properties of the metal.
TarnishExcess of processing product trapped in angles or unsealed welds once the processing is finished and staining the coating.
TechsealFinishing coating for Zintek, galvanising, Dacromet...
Thermal shockTest where a coated part is placed at 120°c for one hour to measure the resistance to heat of the coating.
ThicknessMeasure in microns of the quantity of product applied to a metallic part.
TinningChemical (also called ‘Duclanisation”) or electrolytic application of tin.
Torque N tensionColoured coating, applied to sacrificial coatings in barrel or rack processing, which brings colour, an improvement in the friction coefficient, and resistance to corrosion.
TraceabilityOrganisational method which aims at knowing, even three years after its production, when, how, and with what a part has been coated.
Treatment worksInstallation where dirty water from a factory is reprocessed.
TricoatModern finishing system allowing coatings such as Techseal to be fixed on sacrificial layers (galvanising, Dacromet, Zintek...).
UnitaryIs said of rack processing.
VaporisationPassage from a liquid to a vapour stage.
VarnishNon-metallic product which creates a protective film over a part.
WalterisationPhosphatisation process.
Weight of layerCalculation of weight of Dacromet with which a surface is plated, expressed in grams per square metre.
WeldabilityAction of adding adherence properties between a lead or tin weld and the host metal.
WhitePassivation of a blueish-white colour applied to an electroplate.
White rustZinc oxidisation.
X-rayMethod of analysing the thickness of a processed surface using X-rays.
ZincSilver-coloured metal with exceptional anti-corrosion characteristics.
Zinc phosphatisationCrystalline phospatisation, which improves resistance to corrosion and the cold deformation properties of the processed part.
ZintekHighly resistant flake anti-corrosion coating made with zinc.