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Dacromet-dilapisi Hexagon Soket Countersunk Kepala Bolts
2026-11-02
| Bolt kepala countersunk soket hexagon sing dilapisi Dacromet nggabungake sirah sekrup countersunk sing pas karo lapisan flake seng-aluminium sing menehi 720-1,000 jam tahan semprotan uyah - kaping pirang-pirang luwih dawa tinimbang bolt seng dilapisi elektro konvensional. Artikel iki nerangake geometri bolt, proses lapisan Dacromet, mekanisme anti-karat, lan cara mbandhingake karo perawatan anti karat liyane kanggo sekrup lan bolt. |
1. Pambuka: Apa Proteksi Korosi Penting kanggo Bolts lan Screws
Fasteners - baut, sekrup, kacang, lan mesin cuci - minangka komponen sing paling rawan karat ing sembarang sambungan bolted. A bolt rusted kelangan preload, ngrebut ing bolongan Utas, lan pungkasanipun kompromi integritas struktural kabeh Déwan. Ing lingkungan segara, kreteg dalan gedhe, struktur pemasangan solar, lan mesin ruangan, sekrup sing dilapisi seng biasa bisa nuduhake teyeng putih sajrone pirang-pirang minggu lan teyeng abang sajrone pirang-pirang wulan.
2. Geometri produk: Hexagon Socket Countersunk Kepala Bolt
| Ukuran Utas | Diameter sirah (dk) | Dhuwur sirah (k) | Soket Hex (s) | Kelas Kekuatan Tarik | Dawane umum |
| M5 × 0.8 | 10,0 mm | 2,8 mm | 4 mm | 8.8 / 10.9 | 10–60 mm |
| M6 × 1.0 | 11,4 mm | 3,3 mm | 5 mm | 8.8 / 10.9 | 12–80 mm |
| M8 × 1.25 | 15,0 mm | 4,4 mm | 6 mm | 8.8 / 10.9 | 16–100 mm |
| M10 × 1.5 | 18,5 mm | 5,4 mm | 8 mm | 8.8 / 10.9 | 20–120 mm |
| M12 × 1,75 | 21,5 mm | 6,5 mm | 10 mm | 8.8 / 10.9 | 25–150 mm |
Kaluwihan geometri utama saka jinis sekrup iki:
- Lumahing siram- sirah countersunk ora protrude, mbusak TCTerms snag lan ngidini bagean kawin kanggo njagong warata ing lumahing.
- Kapasitas torsi dhuwur- soket hexagon melu enem pasuryan kontak, ngirim 30-50% torsi luwih saka slotted utawa Phillips drive sadurunge stripping.
- Keterlibatan benang- Utas mesin full-form (utawa benang tunyuk dhewe kanggo aplikasi sheet-metal) nyedhiyakake clamping aksial sing kuwat saka sambungan bolted.
3. Lapisan Dacromet: Cara Kerjane
Dacromet minangka jeneng merek dagang sing wis dadi istilah industri umum kanggo lapisan flake seng-aluminium Applied dening dip-spin utawa semprotan lan cured ing kira-kira 300 ° C. Boten kados electroplating, proses punika non-electrolytic, supaya lapisan ngenalaken ora embrittlement hidrogen - faktor safety kritis kanggo bolt kekuatan dhuwur saka kelas 10.9 lan ndhuwur.
Lapisan kasebut minangka matriks abu-abu salaka saka serpihan seng lan aluminium sing tumpang tindih (biasane 0,1–0,5 µm, total 15–20 µm) sing diikat nganggo pengikat senyawa kromium anorganik. Mekanisme anti-karat ana telu:
4. Kinerja Anti Korosi: Data Semprotan Uyah
Tes pathokan kanggo tahan karat pengikat yaiku tes semprotan uyah netral (NSS) saben ISO 9227 / ASTM B117. Tabel 3 mbandhingaké ngawut-awut Dacromet-dilapisi karo perawatan lumahing alternatif paling umum.
Tabel 3 - Perbandingan tahan korosi (tes NSS, jam nganti teyeng abang pisanan)
| Perawatan lumahing | Ketebalan tipikal | Karat Putih | Karat Abang | Risiko Embrittlement Hidrogen | Indeks Biaya |
| Pelapisan seng bening (Zn) | 5–8 µm | 24–96 jam | 150–300 h | Sedheng | 1.0 |
| Plating seng kuning (Zn-Cr) | 5–8 µm | 96–200 jam | 300–500 h | Sedheng | 1.2 |
| Hot-dip galvanizing (HDG) | 50–100 µm | — | 1.000–2.000 h | kurang | 1.5 |
| Dacromet (1 lapis) | 5–8 µm | 480–720 jam | 720–1.000 h | ora ana | 1.8 |
| Dacromet (2-3 lapisan) | 10–24 µm | 1.000+ jam | 1.500–2.500 h | ora ana | 2.2 |
| Dacromet + top-seal | 10–24 µm | 1.200+ jam | 2.000–3.000 h | ora ana | 2.5 |
5. Kesimpulan
Bolt kepala countersunk soket heksagon sing dilapisi Dacromet ngrampungake rong masalah paling tuwa ing pengikat benang - teyeng lan protrusion - ing siji komponen. Geometri countersunk menehi siram, resik, snag-free peserta karo dhuwur-torque hexagon drive, nalika lapisan flake seng-aluminium menehi kurban lan alangi pangayoman anti-karat tahan 1.000 jam utawa luwih ing testing uyah-semprotan, tanpa embrittlement hidrogen. Kanggo insinyur lan panuku sing nemtokake sekrup lan baut kanggo lingkungan ruangan, segara, utawa transportasi, kelas pengikat iki nawakake salah sawijining rasio proteksi korosi-kanggo-biaya sing kasedhiya ing teknologi bolting modern.
