Ferrous and non ferrous metals.pptx

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COATING
CRITERIA OF CLASSIFICATION OF
COATINGS
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PURPOSE OF
COATING

5. • Construction and Infrastructure:
• Marine and Offshore:
APPLICATION OF COATINGS
• Oil and Gas:
• Manufacturing and Industrial
Equipment:

6. Objectives

9. OIL
PAINTS
ALKYD
PAINTS
SILICONE PAINTS
CASEIN
PAINTS
EPOXY
PAINTS
VARNISHES AND ENAMELS
LATEX PAINTS

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19. COMPATIBILITY CHART FOR ELECTROPLATING
METALS

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24. NON-METALLIC COATINGS
Non-metallic coating are taken to mean
paints which do not contain metal
atoms in the free state.
Non-metals materials examples
• Timber
• Glass
• Graphite
• Plastic
• Polymer
• Ceramic
• Silica
• Diamond

25. (a) Wire and Cable Coating
(b) Planer Coating
(c) Contour Coating
• Non-metals are used as coating material in case of non-metallic
coatings.
• Common types of such coatings are plastic or rubber coating.
• This involves application of a layer of the given polymer onto a
substrate material.
Different categories of such coating are
described below.

26. In this case whole length of conducting
wire or electrical cable is coated with
plastic or polymer to provide thermal or
electrical insulation.
WIRE AND CABLE COATING
PLANER COATING
It involves coating of a flat film over a flat surface.
• This coating generates a robust thin-film which
allows for ease wire jacket pulling / removal, high
slip, enhance release properties, and excellent
corrosion resistance.
• This coating is safe to use with all electrical and
datacomm applications, and other cable types.
USE
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OFFICE

27. It is applied over a three dimensional object.
It can be accomplished by dipping or
spraying
CONTOUR COATING
CONTOUR COATING
USE
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• Interior design
• Glass Industry
SHOWROOM

28. • Enhance the home appearance
• Counter Coating
• Offering interior painting
• Exterior paintings
• Refurnished furniture
• Kitchen cabinets .
USES

29. GALVANIZING

30. WHAT IS GALVANIZING?
GALVANISING IS THE PROCESS OF
APPLYING A PROTECTIVE ZINC COATING
TO STEEL OR IRON, TO PREVENT RUSTING.
THE MOST COMMON METHOD IS HOT-DIP
GALVANIZING, IN WHICH THE PARTS ARE
COATED BY SUBMERGING THEM IN A
BATH OF HOT, MOLTEN ZINC

31. • STEEL FRAMES
• BALCONIES
• VERANDAHS
• STAIRCASES
• LADDERS
• WALKWAYS
• FENCES
• ROOFS
• OUTDOOR
WALKWAYS
WHERE ARE GALVANIZED
COATED METAS USED

32. TYPES OF GALVANIZED COATING
GALVANIZED COATING IS OF TWO
TYPES
• Hot - dip galvanizing
• Cold - dip galvanizing

33. HOT - DIP GALVANIZING PROCESS

34. HOT DIP GALVANIZING
PROCESS
Hot-dip galvanizing is the process of immersing iron or steel in a bath of molten zinc to
produce a corrosion resistant, multi-layered coating of zinc-iron alloy and zinc metal.
While the steel is immersed in the zinc, a metallurgical reaction occurs between the iron
in the steel and the molten zinc.
THE STEPS INVOLVED
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SURFACE PREPRATION
• The purpose of surface preparation in the hot-dip galvanizing process is to obtain the cleanest
possible steel surface by removing all of the oxides and other contaminating residues.
Degreasing
• First the steel is immersed in a degreasing bath such as an alkaline caustic solution to remove
organic contaminants such as dirt, oil, and grease from the surface of the steel. After degreasing the
steel is rinsed with water.
Pickling
• Next the steel is pickled in a dilute solution of either hydrochloric or sulfuric acid (Figure 4), which
removes oxides and mill scale. Once all oxidation has been removed from the steel, it is again rinsed
with water and sent to the final step of the surface preparation.

35. Fluxing
• Finally, the steel is dipped in the flux. The purpose of the flux is to clean the steel of all oxidation developed
since the pickling of the steel and to create a protective coating to prevent any oxidation before entering the
galvanizing kettle. One type of flux is contained in a separate tank, is slightly acidic, and contains a
combination of zinc chloride and ammonium chloride. Another type of flux, top flux, floats on top of the
liquid zinc in the galvanizing kettle, but serves the same purpose.
• After degreasing, pickling, and fluxing, the surface of the steel is a near white metal, clean and completely
free of any oxides or other contaminants that might inhibit the reaction of the iron and molten zinc in the
galvanizing kettle.

36. Cold Galvanizing' is the process of painting steel structures and exteriors with Zinc
– rich paints. “Cold galvanizing” or Zinc painting is the application (by brush or
spray) of Zinc dust mixed with organic or inorganic binders.
COLD DIP GALVANIZING
PROCESS

37. • Lower Costs
As a general rule of thumb, galvanising is lower in initial cost than a lot of other commonly specified corrosion protection coatings for steel, and also offers a lower long term cost.
2: Extremely Long Life
Galvanised coatings on steel can last in excess of 50 years, continually protecting steel against corrosive elements. This useful data sheet from the GAA provides more details about the expected time before first maintenance for a
coating.
3: There is Less Maintenance Required
Hot dip galvanised coatings are self-maintaining, thicker, and because they last longer than other options, maintenance costs of these steel items are inevitably lower.
4: Reliability
As work is carried out to meet AS4680:2006, there are standard, minimum coating thicknesses that have to be achieved. Hence, coating life and performance are reliable and predictable.
5: Tougher Coating
AS4680 coatings are not only generally thicker, but unlike any other steel coating option, they form a metallurgical bond with the steel, which gives them outstanding resistance to any physical damage.
6: Automatic Protection for any Damaged Areas
Galvanised coatings provide a sacrificial protection to the steel. – As an added benefit, and unlike with other coatings small damaged areas do not need touching up.
7: All Over, Complete Protection
With hot dip galvanising, all parts of the fabrication being galvanised is coated, and hence protected, even sharp corners, recesses, or what could normally be inaccessible areas. – No other corrosion protection coating can offer the
same protection to your steel.
8: Ease of Inspection
Galvanised coatings are easily visually inspected: If they appear sound and continuous, then they are.
9: Faster Installation
When you receive a steel product that has been treated by us, it is ready for use. There is no time lost on your site in surface prep or inspection. It is ready for the next construction stage.
10: A Full Coating can be Applied Quickly
We offer fast turnaround times, and the entire process is non weather dependent.
10 Benefits of Hot Dip Galvanising
ADVANTAGE OF HOT DIP OVER COLD DIP

38. ANODIZING

39. • ANODIZING IS AN ELECTROCHEMICAL PROCESS USED TO CREATE A PROTECTIVE OXIDE LAYER ON
THE SURFACE OF METAL OBJECTS. IT IS COMMONLY USED ON ALUMINUM AND ITS ALLOYS,
ALTHOUGH IT CAN ALSO BE APPLIED TO OTHER METALS SUCH AS TITANIUM AND MAGNESIUM.
• THE ANODIZING PROCESS INVOLVES IMMERSING THE METAL OBJECT IN AN ELECTROLYTE SOLUTION
AND PASSING AN ELECTRIC CURRENT THROUGH IT. THE METAL OBJECT ACTS AS THE ANODE
(POSITIVE ELECTRODE) WHILE A CATHODE (NEGATIVE ELECTRODE) IS ALSO PRESENT IN THE
ELECTROLYTE SOLUTION. THE CURRENT CAUSES OXYGEN IONS FROM THE ELECTROLYTE TO
COMBINE WITH THE METAL ATOMS ON THE SURFACE, FORMING A LAYER OF METAL OXIDE.
• THE THICKNESS AND PROPERTIES OF THE ANODIZED LAYER CAN BE CONTROLLED BY ADJUSTING
THE PARAMETERS OF THE PROCESS, SUCH AS THE TYPE OF ELECTROLYTE, VOLTAGE, CURRENT
DENSITY, AND DURATION OF THE TREATMENT. THE RESULTING ANODIZED LAYER IS TYPICALLY
HARD, DURABLE, AND CORROSION-RESISTANT, PROVIDING ENHANCED PROTECTION TO THE
UNDERLYING METAL SUBSTRATE.

40. • IN ADDITION TO IMPROVING THE CORROSION RESISTANCE AND AESTHETICS OF THE METAL SURFACE,
ANODIZING CAN ALSO ENHANCE OTHER PROPERTIES SUCH AS WEAR RESISTANCE, ELECTRICAL
INSULATION, AND THERMAL STABILITY. THE RESULTING ANODIZED COATING CAN BE FURTHER TREATED
WITH SEALANTS OR OTHER COATINGS TO ENHANCE ITS PERFORMANCE AND DURABILITY.
• OVERALL, ANODIZING IS A WIDELY USED SURFACE TREATMENT TECHNIQUE IN VARIOUS INDUSTRIES,
INCLUDING AUTOMOTIVE, AEROSPACE, CONSTRUCTION, AND CONSUMER GOODS, WHERE THE
COMBINATION OF PROTECTION, AESTHETICS, AND IMPROVED PROPERTIES IS DESIRED FOR METAL
PRODUCTS.

41. • Surface Preparation
• Electrolyte Preparation
• Anodizing Bath
• Anodizing Process
• Control Parameters
PROCES
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42. • Corrosion Resistance
• Decorative Finishes
• Increased Hardness and Wear Resistance
• Electrical Insulation
• Adhesive Bonding
• Lubricity and Low-Friction Surfaces
• Heat Dissipation
BENEFITS AND APPLICATIONS

43. ANODISING PROCESS

44. THANK YOU