Galvanic coatings

Galvanic coatings are applied to our nuts for corrosion protection according to customer requirements.

The type of galvanic coatings is indicated with the following abbreviations.

For example: A2F

A = Code letter for coating material (Table 1), in this case zinc
2 = Code number for layer thickness (Table 2), in this case 5 µm
F = Code letter for gloss level and post-treatment (Table 3), in this case bright, bluish

Abbreviation	Element	Code letter
Zn	Zinc	A
Cd	Cadmium	B
Cu	Copper	C
CuZn	Copper-Zinc	D
Ni b	Nickel	E
Ni b Cr r	Nickel-Chrome	F
CuNi b	Copper-Nickel	G
CuNi b Cr r	Copper-Nickel-Chrome	H
Sn	Tin	J
CuSn	Copper-Tin	K
Ag	Silver	L
CuAg	Copper-Silver	N
ZnNi	Zinc-Nickel	P
ZnCo	Zinc-Cobalt	Q
ZnFe	Zinc-Iron	R

Layer thickness (µm)

Single Coating Metal	Double Coating Metals	Code Number
No layer thickness specified	-	0
3	-	1
5	2+3	2
8	3+5	3
10	4+6	9
12	4+8	4
15	5+10	5
20	8+12	6
25	10+15	7
30	12+18	8

Gloss level and post-treatment

Gloss Level		Process Group	Color
A	matte	A	colorless
B	matte	B	bluish
C	matte	C	yellowish
D	matte	D	olive
E	bright	A	colorless
F	bright	B	bluish
G	bright	C	yellowish
H	bright	D	olive
J	glossy	A	colorless
K	glossy	B	bluish
L	glossy	C	yellowish
M	glossy	D	olive
P/U	arbitrary	like B, C, or D	without chromating
R	matte	F/Bk	black
S	bright	F/Bk	black
T	glossy	F/Bk	black

Galvanic coatings are applied using electricity. This is passed through an electrolytic bath. The metal to be applied, such as zinc or nickel, is at the anode, while the object to be coated is at the cathode. The electric current causes metal ions to detach from the consumable electrode and deposit onto the object through reduction. This results in a uniformly coated object. The longer the object remains in the electrolytic bath and the higher the electric current, the thicker the metal layer.

Depending on your requirements, all nuts from Vöhrs can be coated with any galvanic coating for corrosion protection.