Ketebalan Lapisan Zn (μm)

Hasil perhitungan nilai ketebalan Hot Dip Galvanizing baja jenis P.22 dan S.22 a. Baja Jenis P.22

Temperatur Proses Pelapisan Hot Dip Galvanizing

Ketebalan Lapisan

Zn (μm) Ketebalan Lapisan Zn Rata-Rata (μm)

HDG 445°C 87,6 88,6 (88,36 ± 1,493)

88,9

HDG 450°C 107 104 (105,66 ± 2,11)

106

HDG 455°C 119 120 (119 ± 1,00)

118

T = 445°C T = 450°C

m n

t

t 88,36µ

3 1 ,

265 ₌

=

=

∑

m

n t

t 105,66µ 3

317 ₌ =

=

∑

( )

1

2 2

− − =

∆

∑

n t n t

t

( )

1

2 2

− − =

∆

∑

n t n t t

(

)

2

36 , 88 . 3 93 ,

23426 − 2

=

(

)

2

66 , 105 . 3

33501− 2

=

m

µ 493 , 1

= =2,11µm

(

t±∆t

) (

= 88,36±1,493

)

µm

(

t±∆t

) (

= 105,66±2,11

)

µm

T = 455°C

m n

t

t 119µ

3 357

= =

=

∑

( )

1

2 2

− − =

∆

∑

n t n t t

( )

2 119 . 3

42485− 2

=

m

µ 00 , 1 =

Temperatur Proses Pelapisan

Hot Dip Galvanizing Ketebalan Lapisan Zn (μm) Ketebal Lapisan Zn Rata-Rata (μm) HDG 445°C 188

= 231

= 284

Hasil perhitungan nilai kekerasan Hot Dip Galvanizing baja jenis P.22 dan S .22 a. Baja Jenis P.22

Perlakuan Hot Dip Galvanizing

Kekerasan

(VHN) Kekerasan rata-rata (VHN)

HDG 445°C 550 550 (550,33 ± 2,415)

551

HDG 450°C 525 524 (524,66 ± 3,290)

525

HDG 455°C 516 515 (515,33 ± 2,342)

415

T = 445°C T = 450°C

33 , 550 3

1651₌ =

=

∑

n VHN

VHN 524,66

3 1574 ₌ =

=

n VHN VHN

(

)

1

2 2

− − =

∆

∑

n

VHN n VHN

VHN

( )

1

2 2

− − =

∆

∑

n

VHN n VHN VHN

(

)

2

33 , 550 . 3

908601− 2

=

(

)

2

66 , 524 . 3

825826− 2

=

415 , 2

= =3,290

(

VHN±∆VHN

) (

= 550,33±2,415

)

(

VHN ±∆VHN

) (

= 524,66±3,290

)

T = 455°C

33 , 515 3

1546 = =

=

∑

n VHN VHN

( )

1

2 2

− − =

∆

∑

n

VHN n VHN VHN

(

)

2

33 , 515 . 3

796706− 2

=

342 , 2 =

T = 445°C T = 450°C

66 , 531 3

1595 = =

=

∑

n VHN

VHN 530

3 1590

= =

=

n VHN VHN

(

)

1

2 2

− − =

∆

∑

n

VHN n VHN

VHN

( )

1

2 2

− − =

∆

∑

n

VHN n VHN VHN

(

)

2

66 , 531 . 3

908601− 2

=

( )

2 530 . 3

825826− 2

=

311 , 3

= =1,00

(

VHN±∆VHN

) (

= 531,66±3,311

)

(

VHN ±∆VHN

) (

= 530±1,00

)

T = 455°C

526 3

1578 = =

=

∑

n VHN VHN

( )

1

2 2

− − =

∆

∑

n

VHN n VHN VHN

( )

2 526 . 3

796706− 2

=

00 , 1 =

(

VHN±∆VHN

) (

= 526±1,00

)

Perlakuaan Hot Dip Galvanizing

Kekerasan

(VHN) Kekerasan rata-rata (VHN) HDG 445°C

532

(531,66 ± 3,311) 532

531

HDG 450°C

530

(530 ± 1,00) 531

529

HDG 455°C

527

(526 ± 1,00) 526

Hasil perhitungan nilai laju korosi Hot Dip Galvanizing baja jenis P.22 dan S.22 a. Baja Jenis P.22

Perlakuan

Hot Dip Galvanizing

W1

(mg)

ρ

(gr/cm3) A

(inchi2)

Waktu

(Jam)

Laju Korosi

(mpy)

Tanpa Perlakuan 1318,1 5,897 1,735 36 1,910981617

445°C 112,9 7,258 2,23 36 0,103469147

450°C 9,7 7,282 1,659 36 0,011910045

455°C 8,3 7,224 1,705 36 0,009995735

 W_i =m₁−m₂

3321 , 10 6502 ,

11 −

=

gr

3181 , 1 =

mg

1 , 1318 =

2 2 1 1

1 m

m W m

m W

W ∆

∂ ∂ + ∆ ∂ ∂ = ∆

= −m₂∆m₁ + m₁∆m₂

= −10,33210,00005+11,65020,00005

=0,001099115gr

mg

099 , 1 =

W_i ±∆W_i =

(

1318,1±1,099

)

mg

rt r

A=2π 2 +2π

205 , 0 . 433 , 0 . 14 , 3 . 2 433 , 0 . 14 , 3 .

2 2 +

=

=1,520inchi2

t t A r r A

A ∆

∂ ∂ + ∆ ∂ ∂ = ∆

= 4πr+2πr∆r+ 2πr∆t

(

)

2

054 , 0 520 ,

1 inchi

A

A±∆ = ±

t r v=π 2

=3,14.112.5,2 =1975,688mm3

3

975688 ,

1 cm

=

t t A r r A

v ∆

∂ ∂ + ∆ ∂ ∂ = ∆

= 2πrt∆r+ 2πr2∆t

= 359,2160,005+ 759,880,005

=5,59548mm3

3

00559548 ,

0 cm

=

(

)

3

00559 , 0 976 ,

1 cm

v

v±∆ = ±

v m₁

= ρ

975688 ,

1

6502 , 11 =

5,897 3

cm gr

=

v t m

m ∂ ∆

∂ + ∆ ∂

∂ =

∆ρ ρ ₁ ρ

1

v

v m m

v∆ + − ∆

= ₂1

1

1

00559548 ,

0 975688 ,

1

6502 , 11 00005

, 0 975688 ,

1 1

2

− + =

3

017 , 0

cm gr

=

(

5,897 0,017

)

3

cm gr

± =

∆

± ρ

AT WI V_K

ρ 534 =

36 . 735 , 1 . 897 , 5

1 , 1318 . 534 =

=1,910981617MPY

ρ

ρ ∆

∂ ∂ ∆ ∂ ∂ + ∆ ∂ ∂ =

∆ A MPY

A MPY M

WI MPY VK

ρ ρ ρ

ρ ∆ + − ∆ + − ∆

= _{2 2}

. .

. 534 .

. . 534 .

. 534

t A

WI A

t A

WI M

t A

+ −

+

= 0,054

897 , 5 . 36 . 735 , 1

1 , 1381 . 534 00005

, 0 897 , 5 . 36 . 735 , 1

534

2

0,017

897 , 5 . 36 . 735 , 1

3181 , 1 . 534

2

−

MPY

02414449 ,

0 =

MPY V

 Wi =m₁−m₂

2637 , 12 7812 ,

13 −

=

gr

5175 , 1 =

mg

5 , 1517 =

2 2 1 1

1 m

m W m

m W

W ∆

∂ ∂ + ∆ ∂ ∂ = ∆

= −m₂∆m₁ + m₁∆m₂

= −12,26370,00005+13,78120,00005

=0,001302245gr

mg

302245 ,

1 =

Wi ±∆Wi =

(

1517,5±1,302245

)

mg

rt r

A=2π 2 +2π

201 , 0 . 433 , 0 . 14 , 3 . 2 433 , 0 . 14 , 3 .

2 2 +

=

=1,723inchi2

t t A r r A

A ∆

∂ ∂ + ∆ ∂ ∂ = ∆

= 4πr+2πr∆r+ 2πr∆t

= 8,1590,005+ 2,7190,005

=0,054inchi2

Perlakuan Hot Dip Galvanizing

W1

(mg)

ρ

(gr/cm3)

A

(inchi2)

Waktu

(Jam)

Laju Korosi

(mpy)

Tanpa Perlakuan 1517,5 7,112 1,723 36 2,039313485

445°C 187,5 7,534 1,661 36 0,22225154

450°C 12,7 7,393 1,258 36 0,020254926

t r v=π 2

=3,14.112.5,1 =1937,649mm3

=1,937694cm3

t t A r r A

v ∆

∂ ∂ + ∆ ∂ ∂ = ∆

= 2πrt∆r+ 2πr2∆t

= 352,3080,005+ 759,880,005

=5,56094mm3

3

00556094 ,

0 cm

=

(

)

3

00556 , 0 938 ,

1 cm

v

v±∆ = ±

v m₁

= ρ

937694 ,

1

7812 , 13 =

=7,112

v t m

m ∂ ∆

∂ + ∆ ∂

∂ =

∆ρ ρ ₁ ρ

1

v

v m m

v∆ + − ∆

= ₂1

1

1

00556 , 0 937694 ,

11

7812 , 13 00005

, 0 937694 ,

1 1

2

− + =

3

005634802 ,

0

cm gr

=

(

7,112 0,00563

)

3

cm gr

± =

∆

± ρ

AT WI V_K

ρ 534 =

36 . 552 , 1 . 112 , 7

5 , 1517 . 534 =

=2,039313485MPY

ρ

ρ ∆

∂ ∂ ∆ ∂ ∂ + ∆ ∂ ∂ =

∆ A MPY

A MPY M

WI MPY V_k

ρ ρ ρ

ρ ∆ + − ∆ + − ∆

= _{2 2}

. .

. 534 .

. . 534 .

. 534

t A

WI A

t A

WI M

t A

+ −

+

= 0,054

112 , 7 . 36 . 552 , 1

5 , 1517 . 534 00005

, 0 112 , 7 . 36 . 552 , 1

534

2

0,00563

112 , 7 . 36 . 552 , 1

5 , 1517 . 534

2

−

MPY

0726 , 0 =

(

)

MPY V