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 ®
Hot-dip galvanizing
Dec 18, 2014
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.
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.
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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
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