Issue 14

V. Di Cocco et of coatings e and grow trongly increa ere observed ce colours ra

alii, Frattura ed microstructu with differ ses also for l [16], due to nge from gre

Integrità Strutt res. Conside ent chemica ow Ti additio the low Ti c y to violet.

urale, 14 (2010) ring binary Z l compositio ns. Consider ontent. Due

52-63; DOI: 10 n-Ti phase ns, from Z ing the inves to the Ti add

.3221/IGF-ESIS.

14.06

Ti ma Fur %w con

additions im ny new inte thermore, so t Ti, no Zn x sequent Ti a

ply a strong rmetallic ph lidification te Ti y intermeta nd Zn air ox

modification ases nucleat mperature s llic phases w idation, surfa

diagram (Fig n 15 Ti to Zn tigated Zn + ition, and to

. 5), Ti 2 . 0.5 the

1800

1600

1400

1200

?

?

1000

αTi↔βTi

800

?

Zn 15 Ti ?

600

Temperature [°C]

400

200

Zn 10 Ti

ZnTi 2

Zn 2 Ti

Zn 5 Ti

Zn 3 Ti

ZnTi

0

0

10 20

30 40 50

60 70 80

90 100

]

Ti [wt%

Figure 5 : Z

n-Ti phase di

agram [15].

rt of  phas “like  " pha . It is evide and Ti cont rey phase. E re shows a tents (Tab. 2

tructure is st ed, but the t n-coating in (Fig. 6b, dark d 3.5%, resp osition analy Fe content nalysis show rey phase, its

Co pro pre com (ab che neg Mic Fo

ating micros bably observ sent near iro pact phase out 7.6% an mical comp ligible Ti and rohardness a cusing dark g

rongly affec hickness is to terface. The grey), with ectively). Fur sis show tha (1.6 %wt and s an evident microhardne

ted by the T o low to be outer layer i a sort of “ch thermore, a t the light g 0.6 %wt, re increase of V ss is up to tw

i addition (F described an s characteriz ain” morpho lamellar stru rey phase is spectively). ickers values o times high

ig. 6). Near d quantified u ed by a mor logy, that is cture is obse almost pure with the incr er than the i

the iron su sing a LOM e complex m characterized rved mixed Zn, and lam ease of the F ron substrate

bstrate, a so . A compact icrostructure by high Fe with a light g ellar structu e and Ti con .

e is se is nt a ents DS not

).

(a) Figure 6 : Z “like δ”, d

(b) nifications): r structure.

n-Ti coating m ark grey phase

icrostructure , light grey pha

(different mag se and lamella

55