OPERATION OF CORROTION (RUST) PERTEMUAN 12

Matakuliah : S0372 – Kimia Teknik SipilTahun : Ganjil 2007/2008

Bina Nusantara

OPERATION OF RUSTImportant 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.

Bina Nusantara

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.

Bina Nusantara

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.

Bina Nusantara

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.

Bina Nusantara

• 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.

Bina Nusantara

• 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.

Bina Nusantara

• 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

Bina Nusantara

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)

Bina Nusantara

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.

Bina Nusantara

• 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.

Bina Nusantara

• 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.

Bina Nusantara

• ENDUE INORGANIC COVERT1. Glass2. Enamel 3. Cement4. formed of Coat reaction of chemistry5. Oxide coat6. Paint.