Matakuliah : S0372 – Kimia Teknik Sipil
Tahun
: Ganjil 2007/2008
OPERATION OF CORROTION (RUST)
PERTEMUAN 12
OPERATION OF RUST
Important of him operation of corrosion can be seen from
various aspect that is from technical aspect, economic and
company.
1. From Technical facet.
Is adapted by material or location to give protection to
corrosion/rust.
For example for the technique of needed by offshore
development of costly construction like for the drilling of gas
and oil, platformers, depository tank and pipa–pipa which
must contact directly of water dgn go out to sea and sea air
which in character very corrosive. Event of korosi assisted
by tension of yg formed by effect of collision wave giant
which is very influence at age wear and can generate
accident. Also repair in offshore building relative very difficult
to conduct.
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2. From Economic Aspect.
This Aspect very determining because its influence very big,
because to control best corrosion will be costed money
extra.
Usually weared construction low carbon steel without
combination, till when without protection will very easy
attacked by rust.
If selected material unite will much more rustproof, only its
price will much more costly, when compared to low carbon
steel which is ordinary to be weared.
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3. From Aspect Company.
Way of protection of good rust is economic still and
a little a few/little manpower.
But needed by educated manpower. Because loss
by rust will destroy material which is its amount
plenty of. Becoming operation of rust is to represent
the effort thrift of material and energi.
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WAY OF ENDUING IS COVERT :
• Dye Heat.
Way of this weared many, caused by opportunity the
happening of intermetalik. When tying of
intermetalik flimsy, its tying of goodness, but when
too thick hence its tying will be unfavourable caused
by tension which too big. This method by itself
limited by temperature, metal protector and endued
metal.
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• Endue Electrics.
Way of this very good to protect of Au, Ag, Ni, Zn, and
bad Cr but for the Al of and of Nb, because will yield
additional product.
• Veneering without electrics current.
Ni will give good sediment without electrics current with
salt electrolyte of Ni.
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• Douche Metal.
1. With metal strand of metal and pistol.
2. With and pistol of metal powder.
Metal liquefied with plasma or fire later;then
sprayed with air depress or certain gas.
• Ossifying Surface.
By certain element diffusion mains metal like C =
sementasi, N= nitridasi, Zn = Zingkifikasi, Al =
Alumunisasi.
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• Evaporation.
With warm-up inducely or with prisoner strand of
metal, will happened condensation and evaporation.
• Decomposition of organic metal or inorganic.
Decomposition of organic metal or inorganic in
environment of fasa gas become: (At temperature +
800oC )
2CrCl3 + 3H2  2 Cr + 6 HCl
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Taken care of don't happened reaction of to left
side because HCl can react with metal
protected.
Combination of Cr – Fe will in form of the
following reaction :
3/2 CrCl2 + Fe  FeCl3 + 3/2 Cr(Fe)
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ENDUE COVERTLY
• ENDUE NICKEL.
Usually
conducted
by
veneering
or
electrolyse without current. Nickel can be
precipitated direct at metal or can through
metal endue base like copper.
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• ENDUE COVERTLY LEAD (Pb)
Endue covert usually through to dye heat or
electrolysely. To improve;repair coherent energy at
steel, usually enhanced by nickel ( Sn )
• ENDUE COVERTLY of ZINC (Zn)
Is glued to through to dye heat or by elektrolisa.
Zinc have the nature of very good as protector
become militant and function as carbon anode.
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• ENDUE COVERTLY of NICKEL.
At most used for keep the food as canned goods.
But qualify its correct tin of purification and there
may not be any its pollutant.
• ENDUECOVERTLY of ALUMUNIUM.
Its way died hot or by douche, sometime added
The to make gum coat which is not fragible.
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• ENDUE INORGANIC COVERT
1. Glass
2. Enamel
3. Cement
4. formed of Coat reaction of chemistry
5. Oxide coat
6. Paint.
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