Hot-dip galvanizing
22
Ptg. de la Masìa, 13 bxos LD6 08349 Cabrera de Mar – Barcelona (España) Tel: +34 93 754 17 47– Fax: +34 93 754 16 52 [email protected] SOCOVRAI ®
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Presentation of the hot-dip galvanising process and of the different parameters that are important when choosing one product over another. There are two suggestions for different types of treatment lines: a fully acid line with enhanced protection for rough environments needing passivation and another line with alkaline degreasing for extremely greasy parts.
Transcript of Hot-dip galvanizing
Ptg. de la Masìa, 13 bxos LD608349 Cabrera de Mar – Barcelona (España) Tel: +34 93 754 17 47– Fax: +34 93 754 16 [email protected]
SOCOVRAI®
Protect steel & iron againstcorrosion
• A Zn layer is chemically attached to the steel surface.
• Zn corrodes slower than iron and, thus, protects
Hot-dip galvanizing
• Zn corrodes slower than iron and, thus, protects iron from corroding.
• Very strong protection against corrosion.
• Different metals (Ni, Cr…) are attached to the base metal surface.
• Used for high-gloss applications.
Electroplating
HDG is used in heavy-dutyindustries
Building & Construction
Street Furniture & Road Safety
Wire frameWire frame
Utilities & Piping
Agricultural-used steel
Transportation & Automotive
Fasteners
• Acid (cold, pre-etching)• Alkaly (warmed, needs
rinsing off)Degreasing
• Mechanic• Water-based dilution: acid or alkalyEtching
Rinsing
Rinsing
Hot-dip galvanising stages
• ZnCl2 and NH4Cl double and triple salts
• ZnCl2Flux
• Protection against corrosionGalvanising
• Protection against white corrosionPassivation
Rinsing
Drying
Our productsproducts
DEGREASING
GALVANISINGPASSIVATION
ETCHING
FLUX
ANGEM proposes the full range of products
PS series
Additives
Passivants
IC series
Additives
Additives
Salts
SOCOVRAI®PSAG
SOCOVRAI®PSJ
AcidSOCOVRAI®PSB
SOCOVRAI®PSMM
Alkaly
Degreasers
PSJ
SOCOVRAI®PS9M
PSMM
SOCOVRAI®PS198S
SOCOVRAI®PS3xE (electrolithic)
How to choose a degreaser
Dirt type
Shape and quanity of
partsAlloy type
Degreaser
Processcost
Form of application
Advantages of acid degreaser
Acie Alkaly
SOCOVRAI®IC111
SOCOVRAI®IC115
Corrosioninhibitor
SOCOVRAI®AF132
SOCOVRAI®AH131N
Additives
Etching
IC115
SOCOVRAI®IC33
SOCOVRAI®IC120
AH131N
Reduce Fe concentration
A corrosion inhibitor improvesetching
Avoid over-etching
• Higher temperature• Higher HCl
concentration
Difficult to control the acid attack on the metal
Optimum etching requires a balance between HCl y Fe
concentration
• Higher Fe concentration
Etchingspeed
Reduce bath activity
Decapado óptimo en HCl a 20ºC
200
250
300
Co
nc.
de H
ierr
o /
(g
/L)
Exhausted bath Renovate bath
A CI enlarges the margin of etching
0
50
100
150
0 50 100 150 200 250Conc. HCl / (g/L)
Co
nc.
de H
ierr
o /
(g
/L)
Tiempos mayores Óptima Saturación
HCl attacks base metal
A corrosion inhibitor enlarges margins
No
No VOCs
Low toxicity
No
SOCOVRAI ® IC120: environmentally friendly
SOCOVRAI®IC 120
No APEs
No ADR
Environmentally-friendly
Has alcoxylated alcohol and phosphonatedderivatives
SOCOVRAI® AH131N reduces process vapor
SocovraiAH131N
Etching with HCl
AH131N
+ AH131N
ZnCl2
Salts
SOCOVRAI®AF132
Additives
Flux
Double salt
Triple salt
SOCOVRAI®ATH3
SOCOVRAI®AR32
Additives
Galvanizing
Passivation Tri
WithoutChrome(VI)
Passivation 22A
WithChrome(VI)
Passivation
Tri
ADL 3P
22A
Our suggestionssuggestions
PASSIVATION
High-protection acid line
DEGREASING
SOCOVRAI®
ETCHING FLUX
GALVANIZING
SOCOVRAI®
PSAG
80 – 130 g/l25ºCYearlycleaning
SOCOVRAI®
IC120 (0,3%) + AH131N (2 l/m3)
HCl] >100 g/L, [Fe3+]<140 g/LT: 25 ºC
Sel double + SOCOVRAI®
AF132 (5 g/l) + ATH3 (0,5%)
D: 1,2 – 1,26 g/l65 -70ºC
SOCOVRAI®
AR32
450ºC
DE-ZINC
SOCOVRAI®
IC 33
ADL 3P
50-70ºC
Line with alkaly degreaser
DEGREASING
SOCOVRAI®
ETCHING FLUX
GALVANIZING
RINSING
SOCOVRAI®
PSB
7 -20 %55 - 60ºCCleaningevery 6 moths
SOCOVRAI®
IC120 (0,3%) + AH131N (2 l/m3)
HCl] >100 g/L, [Fe3+]<140 g/LT: 25 ºC
Sel double + SOCOVRAI®
AF132 (5 g/l) + ATH3 (0,5%)
D: 1,2 – 1,26 g/l65 -70ºC
SOCOVRAI®
AR32
450ºC
DE-ZINC
SOCOVRAI®
IC 33
Technology
Technical support
Product Proximity
SpeedSpecialized in metal
ANGEM Specialities is:
Bath analysis
R+D
Agility
ISO 9001
Ley de envases –R.D.782/1998
Customized products
Competitive prices
