Construction Rust Prevention
4 anode types — chosen by environment
Sahawatthanakit (1988) manufactures and installs full-line Galvanic Cathodic Protection — Concrete · Aluminium · Zinc · Magnesium Anode — made in Thailand under ISO 9001:2015, DNV Type Approval 2024, and Best SME Innovation Awards. Used in reinforced concrete, ship hulls, piers, river bridges, and buried pipelines — public and private projects nationwide. Based in Nonthaburi, with nationwide delivery plus on-site design and installation — send your site conditions in chat for a quote right away.
Standards & Certifications
Cathodic protection systems designed per ISO 12696:2022 (concrete reinforcement) and NACE SP0169 (pipeline external corrosion) — the standards cited in EGAT / SRT / MEA / PEA TOR plus port and bridge projects in Thailand. Zinc anodes meet ASTM B418 Type II + TIS 3029-2563 (current capacity 781 A·hr/kg). Magnesium anodes per ASTM B843 (1,230 A·hr/kg) for dry soil with resistivity >100 Ω·m. Aluminum anodes per DNV-RP-B401 for offshore. ICCP MMO anodes run 20+ years at DC 1-50 A. Every installation includes a Cu/CuSO₄ reference electrode (per NACE TM0211) plus ON/OFF potential testing every 6 months per ISO 15589-1.
Products sourced from OEM-approved manufacturers — quality and certification you can trust
Concrete Anode UK
Manufactured in Thailand · ISO 9001:2015
4-type Galvanic Cathodic Protection — Concrete, Aluminium, Zinc, Magnesium Anode — TIS 3029-2563, ASTM B418, ISO 12696, NACE, DNV, AMPP certified.
Compare specs + price + recommendations
Free comparison tables — full specs, real prices, standards references, and use-case picks
6 product lines available
Deep dive into specs, working principle, standards, and benefits — click any item to expand.
01Embedded Galvanic Anode for Reinforced Concrete
Cathodic Protection (CP) — for Reinforcing Steel
Embedded Galvanic Anode for Reinforced Concrete
Cathodic Protection (CP) — for Reinforcing Steel
Purpose & best fit
Protects rebar in reinforced concrete from chloride-induced corrosion, carbonation, and saltwater ingress. Suitable for both new construction and repair of existing structures.
Working principle
Zinc anode encased in special alkaline mortar (pH ≥ 14 with lithium hydroxide) prevents zinc passivation. Galvanic current flows to the rebar, maintaining the passive film and preventing chloride-induced corrosion.
Specifications
- Polarization Decay
- ≥ 100 mV
- Protection Radius
- ≥ 60 cm
- Service Life
- ≥ 10 ปี / years
- Mortar pH
- ≥ 14
- Installation
- ผูกกับเหล็กเสริมด้วยลวดหรือเหล็กรัด / Tie-wired or strapped to rebar
Real-world applications
- Reinforced concrete structures in coastal/marine environments
- Piers, jetties, submerged concrete piles
- Bridge decks exposed to chloride deicing
- Dams, pumping stations, structures with saltwater ingress
- Patch repair of corroding existing structures
Benefits & outcomes
- Contains no chlorides or bromides that damage steel
- Easy installation — tie-wired to rebar before concrete pour
- No external power needed (vs. impressed current) — zero maintenance
- Extends structure life ≥ 10 years, reducing long-term repair cost
Industry reference standards
02Aluminium Sacrificial Anode
Marine CP — Seawater & Brackish Water
Aluminium Sacrificial Anode
Marine CP — Seawater & Brackish Water
Purpose & best fit
Protects submerged or splash-zone steel structures in seawater/brackish water — ship hulls, piers, offshore pipelines. Chosen over zinc when high current capacity per unit weight is needed.
Working principle
Based on Galvanic Series — aluminium has lower electrochemical potential than steel and corrodes preferentially, releasing electrons through the electrolyte (seawater) to suppress anodic reaction on the steel surface.
Specifications
- Base Metal
- High-purity aluminium alloy
- Environment
- Seawater + brackish water
- Current Capacity
- สูงกว่าสังกะสีต่อหน่วยน้ำหนัก / Higher than zinc per unit weight
- Forms
- Slab, ribbon, bracelet — ตามแบบโครงการ
Real-world applications
- Ship hulls
- Steel piers & pilings
- Offshore structures, oil platforms
- Ballast tanks
Benefits & outcomes
- Highest current capacity among sacrificial anodes
- Lighter weight per unit of protection vs. zinc
- More cost-effective than Impressed Current systems for medium scale
- Works in both seawater and brackish water — single formulation
Industry reference standards
03Zinc Sacrificial Anode
Marine CP — High-strength steel + overprotection-sensitive systems
Zinc Sacrificial Anode
Marine CP — High-strength steel + overprotection-sensitive systems
Purpose & best fit
Protects ship hulls, sea chests, heat exchangers, and seawater-immersed steel where low driving voltage is needed to prevent over-protection (coating disbondment, hydrogen embrittlement).
Working principle
High-purity zinc (≥ 99.995%) corrodes preferentially via galvanic action. Lower driving voltage than aluminium/magnesium — safer for high-strength steel that can suffer hydrogen embrittlement under over-protection.
Specifications
- Purity
- ≥ 99.995% Zn
- Driving Voltage
- ต่ำสุดในกลุ่ม sacrificial / Lowest of the three
- Environment
- Seawater (low resistivity)
Real-world applications
- Cargo ship hulls
- Sea chest, mooring chains
- Seawater-cooled condensers/heat exchangers
- Marine steel & aluminium equipment
Benefits & outcomes
- Low driving voltage reduces over-protection risk
- Prevents coating disbondment from hydrogen evolution
- Minimises hydrogen embrittlement in high-strength steel
- Compliant with MIL-A-18001K and DNV-GL
Industry reference standards
04Magnesium Sacrificial Anode
CP for high-resistivity environments
Magnesium Sacrificial Anode
CP for high-resistivity environments
Purpose & best fit
Protects structures in freshwater and high-resistivity soil — where aluminium/zinc cannot drive sufficient current. Used for buried pipelines, underground tanks, and freshwater heaters.
Working principle
Magnesium has the lowest electrochemical potential (~−1.55 V) — the highest driving voltage in the sacrificial family. Can push current through high-resistivity electrolytes (freshwater, soil) where Al/Zn cannot.
Specifications
- Driving Voltage
- สูงสุดในกลุ่ม / Highest of the three
- Environment
- น้ำจืด, ดิน, high-resistivity electrolyte
- Forms
- Bagged anodes (สำหรับฝังดิน), Cast slab
Real-world applications
- Buried pipelines (oil, gas, water)
- Underground storage tanks (USTs)
- Hot-water heater steel tanks
- Freshwater structures (dams, lakes)
Benefits & outcomes
- Highest driving voltage — works in high-resistivity media
- Suited to Thai soils which often have elevated resistivity
- No external power source needed
- Bagged form simplifies underground installation
Industry reference standards
05Single-Component Moisture-Curing Polyurethane Primer
Industrial Coating — Rust Prevention
Single-Component Moisture-Curing Polyurethane Primer
Industrial Coating — Rust Prevention
Purpose & best fit
One-part moisture-curing polyurethane primer that cures via atmospheric humidity. Functions as primer, intermediate coat, topcoat, or single-layer finish. Contains aluminium flake for barrier protection.
Working principle
Isocyanate groups in the resin react with airborne moisture (H₂O) to form urea crosslinks, curing into a hard film. Aluminium flakes align in lamellar pattern, blocking water and oxygen ingress.
Specifications
- System
- 1K Moisture-Curing Polyurethane (MCP)
- Recommended DFT
- 150 ไมครอน / 150 µm
- Salt Spray (ASTM B117)
- ผ่าน 2,000 ชม. ที่ 150 µm / Pass 2,000 hr at 150 µm
- Application
- แปรง / ลูกกลิ้ง / airless spray
- Substrates
- เหล็ก, เหล็กชุบกัลวาไนซ์, เหล็กสนิม, อลูมิเนียม, คอนกรีต, ไม้, พลาสติก
Real-world applications
- Tanks, vessels, factory steel piping
- Steel structures with existing rust (no need for SA 2½ blast)
- Plant maintenance touch-ups without shutting down production
- Tight-access steelwork — brush-applicable
Benefits & outcomes
- Apply over existing rust — no full sand-blast to SA 2½ required
- Single-component eliminates mixing error and pot-life concerns
- Faster work cycle and curing time vs. 2K epoxy systems
- Chemical- and UV-resistant
Industry reference standards
06Solvent-Free Two-Component Epoxy (Underwater-Applicable)
Industrial Coating — Underwater Repair
Solvent-Free Two-Component Epoxy (Underwater-Applicable)
Industrial Coating — Underwater Repair
Purpose & best fit
Two-component solvent-free epoxy applicable directly to wet, damp, or fully submerged surfaces. For structures that cannot be dry-docked or fully dried before repair.
Working principle
Solvent-free epoxy chemistry — does not need to displace moisture; it incorporates surface water into the polymer matrix. Provides simultaneous resistance to acids, alkalis, amines, salts, and solvents.
Specifications
- System
- 2-component solvent-free epoxy
- Recommended DFT
- 400 ไมครอน / 400 µm
- Salt Spray (ASTM B117)
- ผ่าน 2,000 ชม. ที่ 400 µm / Pass 2,000 hr at 400 µm
- Application Temp
- 10 – 40 °C
- VOC
- Solvent-free, low odor
- Substrates
- เหล็ก, เหล็กที่มีสนิม, คอนกรีต — เปียก/ชื้น/ใต้น้ำได้
Real-world applications
- Risers, pipes, splash-zone structures (oil & gas)
- Underwater pier repair, submerged piling
- Treatment ponds, acid/alkali process equipment
- On-stream repair without shutting down machinery
Benefits & outcomes
- Applies on wet, damp, or fully submerged surfaces — no dry-docking
- Solvent-free, low VOC — safe in confined spaces
- Broad chemical resistance (acid, alkali, amine, salt, solvent)
- Brush/roller-applied — no separate primer required
Industry reference standards
All products available — pricing quoted by volume and delivery schedule
Aluminium Sacrificial Anode
SKU TMP-AL-ANODE- · Type: Al-Zn-In sacrificial anode
- · standards: TIS 3359-2563,DNV-GL
- · application: ship hulls/piers/offshore (seawater + brackish)
- · common_sizes: 5kg,10kg,14kg,20kg,24kg,40kg
BIO TOUGH+ Antimicrobial Concrete Sealer (White)
SKU TMP-BIOTOUGH-WT- · Type: water-based acrylic-polymer silicate
- · Color: white
- · silicate: min 10%
- · stain_resistance: anti-efflorescence + chemical/dirt
- · hardness_increase: 3-5x
- · antimicrobial_life: 3-5 years
BIO TOUGH+ Antimicrobial Concrete Sealer (Milk White)
SKU TMP-BIOTOUGH-MW- · Type: water-based acrylic-polymer silicate
- · Color: milk white
- · silicate: min 10%
- · hardness_increase: 3-5x
- · antimicrobial_life: 3-5 years
Concrete Sacrificial Anode CR100
SKU TMP-CR100- · core: zinc in alkaline mortar
- · Type: sacrificial concrete anode
- · Capacity: larger than CR60
- · standards: TIS 3029-2563,ASTM B418 Type II,ISO 12696
- · service_life_min: 10 years
Concrete Sacrificial Anode CR60
SKU TMP-CR60- · core: zinc in alkaline mortar
- · Type: sacrificial concrete anode
- · standards: TIS 3029-2563,ASTM B418 Type II,ISO 12696
- · service_life_min: 10 years
- · protection_radius_min: 60cm
Magnesium Sacrificial Anode (fresh water)
SKU TMP-MG-ANODE- · Type: magnesium anode
- · application: fresh water — barges/pontoons/river bridges/underground pipelines/water heater
High-Purity Zinc Sacrificial Anode
SKU TMP-ZN-ANODE- · Type: zinc anode
- · purity: Zn 99.995% min
- · standards: MIL-A-18001K,GL-Zn1,DNV-GL
- · common_sizes: 5kg,10kg,12kg,24kg
SGU-201 Two-Part Solvent-Free Epoxy (Wet/Underwater)
SKU TMP-SGU-201- · DFT: 400 microns
- · VOC: zero
- · Type: 2-comp solvent-free epoxy
- · salt_spray: 2000 hr ASTM B117
- · substrates: dry/damp/submerged steel/concrete,no primer required
- · application_temp: 10-40°C
SGL-301 Glow-in-the-Dark PU (Blue-Green)
SKU TMP-SGL-301-BG- · Type: 2-comp water-based PU luminous
- · Color: blue-green
- · coverage: 5 sqm/kg per coat
- · glow_duration: 8-12 hr
- · luminescence_life: min 1 year
SGL-301 Glow-in-the-Dark PU (Yellow-Green)
SKU TMP-SGL-301-YG- · Type: 2-comp water-based PU luminous
- · Color: yellow-green
- · coverage: 5 sqm/kg per coat
- · glow_duration: 8-12 hr
- · luminescence_life: min 1 year
SGP-001 One-Part Moisture-Curing Polyurethane
SKU TMP-SGP-001- · DFT: 150 microns
- · Type: 1-comp moisture-curing PU
- · salt_spray: 2000 hr ASTM B117
- · substrates: steel,galvanized,aluminium,rusted steel,concrete,wood,plastic
- · application: brush,roller,airless spray
- · common_pack: 1L,4L,20L
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4 innovation coatings — Thai-made, internationally certified
Before you send an RFQ
Q1.How does Cathodic Protection work?+
Q2.Zinc vs Aluminum vs Magnesium anode — which?+
Q3.Anode replacement interval?+
Q4.Is SP10 surface prep really required before coating?+
Q5.Bio Tough+ vs standard epoxy — difference?+
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