DACROMET HEXAGON BOLTS - superieure korrosjebestindige befestigingsoplossingen

05-11-2026

1. Ynlieding ta Dacromet Hex Bolts

Dacromet hexagon bolts represent a high-performance class of fasteners engineered for exceptional corrosion resistance and long-term rust prevention. These bolts combine the mechanical reliability of standard hexagonal-head bolts with an advanced zinc-aluminum flake coating known as Dacromet (also referred to as Dacro or zinc-flake coating). The result is a bolt that delivers outstanding anti-corrosion performance in harsh environments while preserving precise thread geometry and high tensile strength.

DACROMET HEXAGON BOLTS-Superior Corrosion (1)

Oars as konvinsjonele elektro-galvanisearre of hot-dip galvanisearre bouten, brûke Dacromet-hexagonbouten in net-elektrolytysk coatingproses. Dit elimineert it risiko fan wetterstofbrosheid - in kritysk foardiel foar bouten mei hege sterkte fan klassen 8.8, 10.9 en 12.9. The thin, uniform Dacromet film (typically 4–12 μm) provides superior salt-spray resistance, heat resistance, and overall anti-rust durability, making these bolts the preferred choice in automotive, construction, wind energy, marine, and industrial equipment applications.

2. Wat is Dacromet Coating?

Dacromet is an inorganic, water-based metal surface treatment technology consisting primarily of ultra-fine zinc flakes, aluminum flakes, and chromium-based binders. When applied to a hexagon bolt and cured at elevated temperature (approximately 300 °C), the flakes align into multiple overlapping layers, forming a dense, metallic silver-gray barrier. This multi-layer structure creates both a physical barrier against moisture and electrolytes and a sacrificial anodic protection mechanism that actively resists rust formation.

The coating on a Dacromet hexagon bolt offers dual protection: the zinc flakes act as a sacrificial anode, corroding preferentially to protect the steel substrate, while the aluminum flakes and inorganic matrix enhance barrier properties and improve overall corrosion resistance. Because the process is non-electrolytic, no hydrogen is introduced into the steel lattice, preserving the full mechanical integrity of high-strength bolts.

3. Dacromet Coating Proses foar Hexagon Bolts

The production of a reliable Dacromet hexagon bolt follows a carefully controlled sequence designed to maximize adhesion, uniformity, and anti-corrosion performance:

1. Oerflak tarieding: De bout ûndergiet yngeand skjinmeitsjen en meganyske of alkaline derusting. Acid pickling wurdt bewust mijd om wetterstof absorption foar te kommen dat kin liede ta brosheid fan hege-sterkte bouten.

2.Coating applikaasje: De skjinmakke hexagon bouten wurde ûnderdompele yn, spuite mei, of dip-spûnen yn in wetter-basearre Dacromet slurry mei sink en aluminium flakes. Dip-spin is de meast foarkommende yndustriële metoade foar bulkferwurking fan bouten.

3. Curing / Sintering: De coated bouten wurde bakt op likernôch 300 ° C. Tidens it genêzen reageart it bynmiddel en de metallyske flakes sinterje yn in trochgeande, strak oanhingjende anorganyske film.

4.Kwaliteitsynspeksje: Finished Dacromet hexagon bolts are checked for coating thickness, adhesion, appearance, and salt-spray performance to guarantee consistent anti-rust protection.

4. Prestaasje ferliking fan anty-corrosie Coatings

De folgjende tabel vat de wichtichste ferskillen gear tusken Dacromet-hexagon-bouten en bouten ôfmakke mei tradisjonele anty-roestmetoaden:

Eigendom	Dacromet	Electro-galvanisearjen	Hot-dip galvanizing
Coating Dikte	4-12 μm	5-15 μm	40-85 μm
Salt Spray (gjin reade roest)	600–1.200+ h	100-300 oere	500-800 oere
Hydrogen Embrittlement Risiko	Gjin	Heech (ferlet bakken)	Leech - Medium
Heat Resistance	Oant 300 °C	≤ 100–120 °C	≤ 200 °C
Thread Fit Impact	Minimal / Standert nuts OK	Minimaal	Wichtich (kin oermaat nedich wêze)
Miljeu Profile	Water-basearre, lege fersmoarging	Offalwettersuvering nedich	Sink slag / ôffalwetter

DACROMET HEXAGON BOLTS-Superior Corrosion (2)

5. Typyske tapassingen fan Dacromet Hexagon Bolts

Thanks to their outstanding corrosion resistance, hydrogen-embrittlement-free nature, and dimensional accuracy, Dacromet hexagon bolts are widely specified in demanding sectors:

Automotive en kommersjele auto's: Motorkomponinten, chassis, ophinging en befestigingen ûnder it lichem dy't moatte wjerstean dyk sâlt en fochtichheid.
Wynenerzjy en duorsume enerzjy: Toer, nacelle, en stifting bouten bleatsteld oan kust of offshore klimaten.
Konstruksje en ynfrastruktuer: Strukturele ferbiningen, brêgen, en bûten stielwurk dy't lange-termyn anty-rustprestaasjes nedich binne.
Marine en offshore: Apparatuer en strukturele bouten ûnderwurpen oan trochgeande sâlt-laden atmosfearen.
Yndustriële masines en swiere apparatuer: Hege sterkte bolted gewrichten yn omjouwings dêr't sawol meganyske betrouberens en corrosie beskerming binne essinsjeel.

6. Technyske spesifikaasjes en Performance Data

Typyske prestaasjes yndikatoaren foar Dacromet-coated hexagon bolten wurde gearfette hjirûnder. Eksakte wearden binne ôfhinklik fan coating grade (Bygelyks Dacromet 320 of 500) en proses parameters.

Parameter	Typyske wearde / prestaasjes
Coating System	Sink + aluminium flakes (Dacromet 320 / 500)
Uterlik	Metallic sulvergriis, mat oant satyn
Typyske Dry Film Thickness	4–12 μm (klasse A / B ôfhinklik fan spesifikaasje)
Salt Spray Resistance (ISO 9227)	≥ 600 h (klasse A) oant ≥ 1.000–1.200 h (klasse B) sûnder reade roest
Maksimum trochgeande tsjinst temperatuer	Likernôch 300 °C
Hydrogen fersmoarging	Gjin (net-elektrolytysk proses)
Geskikte Bolt Strength Grades	4.8, 8.8, 10.9, 12.9 en heger
Thread Kompatibilität	standert nuts; minimale ynfloed op pitch diameter
Common Standards / References	ISO 10683 (relatearre sink-flake systemen), OEM automotive specs

7. Konklúzje

Dacromet hexagon bolts offer a modern, high-performance solution for applications that demand both high mechanical strength and outstanding long-term corrosion resistance. Troch it kombinearjen fan in tinne, net-elektrolytyske sink-aluminium flake coating mei sekuere hexagonal mjitkunde, dizze bouten elimineren wetterstof-brosheid risiko's wylst it leverjen fan sâlt-spray ferset fier superieur oan konvinsjonele electro-galvanizing. Harren treflike waarmtebestriding, threadkompatibiliteit, en miljeufreonlikens ferbetterje har wearde fierder yn 'e automotive, enerzjy, bou en yndustriële sektoaren.

When specifying fasteners for corrosive service environments, engineers and buyers increasingly turn to Dacromet-coated hexagon bolts as the reliable, anti-rust choice that protects critical joints for decades. Goede proseskontrôle en kwaliteitsferifikaasje soargje derfoar dat elke bout de folsleine korrosjebeskermingsprestaasjes leveret wêr't de Dacromet-technology bekend om is.

In summary, the Dacromet hexagon bolt stands as a proven, cost-effective, and technically superior anti-corrosion fastener for the most demanding applications.

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