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63

Blackchrome Selective Surfaces on Aluminium Substrates

Preparation Techniques and Properties

* s. Visitserngtrakul

Abstract

** c. Koompat

* K. Kirtikara

Electroplating techniques used for preparing blackohrome

selective surfaces on aluminium substrates are described in this paper.

The technique of gradient search was employed to determine optimum

electroplating conditions; the objective function of the gradient

search is maximisation of solar absorbtance ( & ) of surfaces subject s

to the constraint that thermal emittance (Et) of surfaces is less

than 0.2

Optimum eleatroplatinq ranges were found around the vicinity

of the following electroplating conditions : chromic acid concentration

o! 312 g/l , 25 ' (by volume) of chromonyse additive, bath temperature

of 24°c, current density of 25 A/dm2 and 5-minute plating time. All

surfaces prepared under these conditions possessed ot larger than 0. 9 s

and Et less than 0.07

Very good thermal and mechanical stabilities were exhibited

by the prepared surfaces. ot8

and Et remained basically unchanged after

being subjected to the heating at 200°0 for 2714 hours. Rubbing of

surfaces by dry and wet clothes had negligible effects on the volums

* School of Energy and Materials , KMITT.

64

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+ 3e

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+ H2o + H+

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67

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68

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69 .

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70

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71

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0

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72

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38 0.974 0.060

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41 0.976 0.079

42 0.973 0.080

43 0.978 0.090

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23 0.975 0.084

24 0.971 0.078

25 0.974 0.074

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28 0.971 0.067

29 0.971 0.071

30 0.971 0.074

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33 0.972 0.073

34 0.963 0.063

35 0.968 0.063

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45 0.943 0.070

73

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74

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~\'l"'l~L~~ 0 94 208 256 346 514 754 1156 1970 2714

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22

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21

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24

21

34

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.974 .070 .976 .065 .976 .066 975 067 976 066 974 068 976 071 975 068 974 068 .975 .059

.971 .068 ;~3 .067 .~73 .065 .97~ 063 972 065 971 068 973 066 972 068 970 070 .972 .058

.974 .068 .975 .068 .974 .067 974 069 976 066 975 070 977 066 976 068 975 066 .976 .069

.974 .060- .976 .061 .973 .062 974 061 975 061 974 064 976 064 975 064 973 064 .975 .063

.975 .0-71 .9.75 .068 .975 .072 975 068 976 069 975 072 975 075 976 073 ' 974 073 .974 .070

.976 .079 .976 .oso .975 .oa2 977 079 977 000 976 083 971 084 977 011 975 084 .976 .osl.

.973 .oao .974 .011 .975 .016 978 018 975 016 973 011 975 011 975 001 973 000 .975 .011

.974 .076 .974 .072 .974 .073 974 074 975 074 974 075 975 075 975 069 975 076 .975 .073

.975 .084 .976 .074 .975 .078 975 075 9-77. 076 976 077 9-77 079 977 075 976 077 .977 .065

.971 .01a .912 .0-10 .973 .016 911 013 9-n 016 912 011 973 080 973 081 971 015 .973 .011

.969 .073 .970 .072 .968 .072 968 070 969 069 967 074 970 073 970 077 968 074 .969 .077

.963 .063 .976 .062 .964 .063 963 063 964 061 963 064 964 063 964 063 962 064 .965 .062

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0.1 mg Zn per sq in 0 23 mg Zn per sq in · 0.39 mg Zn per sg in

(Cl) (b)

(C) Cd)

81

1. 1(1l"l'Wiiw "S~to:ti«\191'1:.:t;ia , n"l111"li1'1l"l•::ff L111J"l::i1'11i.1..1n"l1'l\Hl'llatJf.l·u Gan,..,,11fl11Jf1'1

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2. Metal Finishing Guidebook. and Directory Issue'82, Metals and

Plastics Publications, Ina., Volume 80, No. lA, JAN 1982.

3. s.WERNICK, R. PrtnmR, The Surface Treatment and Finishing of

Aluminium and Its Alloys, Fourth Edition, Robert Draper Ltd., 1972,

pp. 898-976.

4. F .A. LOWENHEIM, Modern Eleatropla ting, John Wiley & Sons, · Ina • ,

1963, pp. 556-564 •

5. .,. . .

Uu~ a.,,,..,,Q, ,n"l1~~9les1u«1 (private conmunication)