{
    "slug": "coating-thickness",
    "title": "仕上げ別の皮膜厚さと塩水噴霧時間",
    "description": "13種類のCNC仕上げにおける皮膜厚さと塩水噴霧時間：陽極酸化、亜鉛めっき、HDG、亜鉛フレーク、リン酸塩皮膜、黒色酸化、粉体塗装、Ni-Cr。終点の定義を明記。",
    "lang": "ja",
    "tables": [
        {
            "caption": "皮膜厚さと耐食性 — 13種類の仕上げ（NSSはASTM B117 / ISO 9227による）",
            "columns": [
                "プロセス",
                "皮膜厚さ（µm）",
                "塩水噴霧 NSS — 終点を明記",
                "基材",
                "代表的な用途",
                "コスト階層（編集評価、1–5）",
                "規格",
                "出典"
            ],
            "rows": [
                {
                    "プロセス": "Anodizing Type II (sulfuric, conventional)",
                    "皮膜厚さ（µm）": "5–25 (spec window 2–25; decorative Class 2 commonly 8–15)",
                    "塩水噴霧 NSS — 終点を明記": "336 h, sealed specimens, no corrosion beyond spec limits",
                    "基材": "Aluminum alloys",
                    "代表的な用途": "筐体、民生エレクトロニクス、装飾",
                    "コスト階層（編集評価、1–5）": "3",
                    "規格": "MIL-PRF-8625F (formerly MIL-A-8625F) Type II",
                    "出典": "S1 / S3 / S4"
                },
                {
                    "プロセス": "Anodizing Type III (hardcoat)",
                    "皮膜厚さ（µm）": "25–75 (nominal 50.8 µm / 0.002 in)",
                    "塩水噴霧 NSS — 終点を明記": "336 h, sealed specimens, no corrosion beyond spec limits",
                    "基材": "Aluminum alloys",
                    "代表的な用途": "油圧ボア、耐摩耗プレート",
                    "コスト階層（編集評価、1–5）": "4",
                    "規格": "MIL-PRF-8625F Type III; ISO 10074",
                    "出典": "S2 / S3"
                },
                {
                    "プロセス": "Electroless nickel, mid-phosphorus (Type IV, 5–9% P)",
                    "皮膜厚さ（µm）": "SC1 5 / SC2 13 / SC3 25 / SC4 75 (minimums)",
                    "塩水噴霧 NSS — 終点を明記": "Typically 48–96 h to red rust (supplier data; B733 itself sets no NSS hours)",
                    "基材": "Steel, aluminum, stainless, copper alloys",
                    "代表的な用途": "バルブボディ、一般産業部品",
                    "コスト階層（編集評価、1–5）": "4",
                    "規格": "ASTM B733",
                    "出典": "S5 / S6 / S7"
                },
                {
                    "プロセス": "Electroless nickel, high-phosphorus (Type V, above 10% P)",
                    "皮膜厚さ（µm）": "≥25 (SC3 and up; marine commonly 50)",
                    "塩水噴霧 NSS — 終点を明記": "Typically ≥1,000 h to red rust at 25 µm; up to 2,000 h after diffusion treatment (supplier data)",
                    "基材": "Steel, aluminum, copper",
                    "代表的な用途": "海洋、石油・ガス、非磁性部品",
                    "コスト階層（編集評価、1–5）": "5",
                    "規格": "ASTM B733 (high-phosphorus salt-spray clause)",
                    "出典": "S5 / S7 / S8 / S9"
                },
                {
                    "プロセス": "Zinc electroplate + clear trivalent passivate (Type V)",
                    "皮膜厚さ（µm）": "SC1 5 / SC2 8 / SC3 12 / SC4 25 (minimums)",
                    "塩水噴霧 NSS — 終点を明記": "72 h to white rust (Type V)",
                    "基材": "Steel",
                    "代表的な用途": "屋内・軽負荷の締結具と部品",
                    "コスト階層（編集評価、1–5）": "2",
                    "規格": "ASTM B633",
                    "出典": "S10 / S11 / S12"
                },
                {
                    "プロセス": "Zinc electroplate + colored passivate (Type II hexavalent / Type VI trivalent)",
                    "皮膜厚さ（µm）": "SC1 5 / SC2 8 / SC3 12 / SC4 25 (minimums)",
                    "塩水噴霧 NSS — 終点を明記": "96 h (Type II) / 120 h (Type VI) to white rust",
                    "基材": "Steel",
                    "代表的な用途": "屋外に近い環境の金物",
                    "コスト階層（編集評価、1–5）": "2",
                    "規格": "ASTM B633",
                    "出典": "S10 / S11 / S12"
                },
                {
                    "プロセス": "Hot-dip galvanizing (HDG)",
                    "皮膜厚さ（µm）": "45–100 (A123 grade, by steel category and thickness); EN ISO 1461: 85 µm average on steel ≥6 mm",
                    "塩水噴霧 NSS — 終点を明記": "Not specified by standard — accepted by thickness; typically 500 h+ to red rust (supplier data)",
                    "基材": "Steel",
                    "代表的な用途": "構造物、長寿命の屋外用途",
                    "コスト階層（編集評価、1–5）": "2",
                    "規格": "ASTM A123 (parts) / A153 (fasteners); EN ISO 1461",
                    "出典": "S14 / S15 / S16 / S26"
                },
                {
                    "プロセス": "Zinc-flake coating (Dacromet / Geomet type)",
                    "皮膜厚さ（µm）": "4–10 (sealer plus topcoat, reference)",
                    "塩水噴霧 NSS — 終点を明記": "240 h at 4 µm / 480 h at 5 / 600 h at 6 / 720 h at 8 / 960 h at 10 µm, no red rust; 72 h no red rust at a scribe (sacrificial)",
                    "基材": "Steel (preferred on ≥1,000 MPa high-strength fasteners)",
                    "代表的な用途": "自動車シャシーのボルト、水素脆化を排除すべき用途",
                    "コスト階層（編集評価、1–5）": "3",
                    "規格": "ISO 10683:2018",
                    "出典": "S17 / S18 / S19"
                },
                {
                    "プロセス": "Zinc phosphate (Type Z) + oil (Class 2)",
                    "皮膜厚さ（µm）": "2–15",
                    "塩水噴霧 NSS — 終点を明記": "≥72 h to red rust with the specified oil supplement",
                    "基材": "Steel",
                    "代表的な用途": "塗装・粉体塗装の前処理、締結具",
                    "コスト階層（編集評価、1–5）": "1",
                    "規格": "MIL-DTL-16232G",
                    "出典": "S20 / S21 / S23"
                },
                {
                    "プロセス": "Manganese phosphate (Type M) + oil (Class 2)",
                    "皮膜厚さ（µm）": "Heavy film (accepted by coating weight per area, not µm)",
                    "塩水噴霧 NSS — 終点を明記": "≥48 h to red rust with the specified oil supplement",
                    "基材": "Steel",
                    "代表的な用途": "なじませと保油を要する歯車・摺動部品",
                    "コスト階層（編集評価、1–5）": "1",
                    "規格": "MIL-DTL-16232G (DFL supplemental system: 100 h clause)",
                    "出典": "S20 / S22 / S23"
                },
                {
                    "プロセス": "Black oxide + supplementary oil or wax",
                    "皮膜厚さ（µm）": "0.5–2 (magnetite film ≈0.76 µm)",
                    "塩水噴霧 NSS — 終点を明記": "24–48 h (S26) / 24–72 h (S24) to red rust — both intervals listed, see the register",
                    "基材": "Steel, stainless",
                    "代表的な用途": "屋内機械、外観、寸法変化ゼロ",
                    "コスト階層（編集評価、1–5）": "1",
                    "規格": "MIL-DTL-13924",
                    "出典": "S24 / S25 / S26"
                },
                {
                    "プロセス": "Powder coating (epoxy / polyester / hybrid)",
                    "皮膜厚さ（µm）": "60–120",
                    "塩水噴霧 NSS — 終点を明記": "Typically epoxy 1,000+ h / polyester 500–1,000 h / hybrid 500–800 h; acceptance by scribe creepage ≤2–3 mm (ASTM D1654)",
                    "基材": "Steel, aluminum",
                    "代表的な用途": "筐体、家具、建築",
                    "コスト階層（編集評価、1–5）": "2",
                    "規格": "Test methods ASTM B117 + D1654/D714 (no single governing spec; QUALICOAT for architectural)",
                    "出典": "S27 / S28 / S29"
                },
                {
                    "プロセス": "Decorative nickel + chromium (Ni/Cr)",
                    "皮膜厚さ（µm）": "Ni 10–30 + Cr 0.13–0.8 (DB34 example: Ni ≥20 + Cr ≥0.25)",
                    "塩水噴霧 NSS — 終点を明記": "NSS 24–96 h depending on system (single-layer 12 µm Ni ≈24 h; copper under-layer + multilayer Ni passes 96 h); acceptance via CASS (ASTM B368), SC4 service condition 22–24 h",
                    "基材": "Steel, brass, copper alloys",
                    "代表的な用途": "外観金物、ハンドツール",
                    "コスト階層（編集評価、1–5）": "4",
                    "規格": "ASTM B456 / B368",
                    "出典": "S30 / S31"
                }
            ]
        },
        {
            "caption": "部品が6061アルミです。塩水噴霧500時間に耐える皮膜はどれですか？",
            "columns": [
                "皮膜（アルミ適用可）",
                "厚さ（µm）",
                "NSS時間",
                "読み方"
            ],
            "rows": [
                {
                    "皮膜（アルミ適用可）": "Type II anodize, sealed",
                    "厚さ（µm）": "5–25",
                    "NSS時間": "336 h (spec)",
                    "読み方": "外観用途の既定。寸法に厳しい"
                },
                {
                    "皮膜（アルミ適用可）": "Type III hardcoat, sealed",
                    "厚さ（µm）": "25–75",
                    "NSS時間": "336 h (spec); typically higher",
                    "読み方": "耐摩耗と耐食を一段階で"
                },
                {
                    "皮膜（アルミ適用可）": "High-phosphorus electroless nickel",
                    "厚さ（µm）": "≥25",
                    "NSS時間": "≥1,000 h typical (supplier data)",
                    "読み方": "盲穴でも均一。1,000 h以上の選択肢"
                },
                {
                    "皮膜（アルミ適用可）": "Polyester powder",
                    "厚さ（µm）": "60–120",
                    "NSS時間": "500–1,000 h typical",
                    "読み方": "最も厚いバリア。寸法増加が最大"
                }
            ]
        },
        {
            "caption": "硬質陽極酸化で部品寸法はどのくらい増えますか？",
            "columns": [
                "ケース",
                "厚さ（µm）",
                "片面あたりの成長（µm）",
                "被覆した直径での増加（µm）"
            ],
            "rows": [
                {
                    "ケース": "Type III at nominal 50 (spec 50.8 µm / 0.002 in)",
                    "厚さ（µm）": "50",
                    "片面あたりの成長（µm）": "≈25",
                    "被覆した直径での増加（µm）": "≈50"
                },
                {
                    "ケース": "Type II at the 8–15 mid-band (12 µm, calculated)",
                    "厚さ（µm）": "12",
                    "片面あたりの成長（µm）": "≈6",
                    "被覆した直径での増加（µm）": "≈12"
                }
            ]
        },
        {
            "caption": "屋外では亜鉛めっきの厚さはどのくらい必要ですか？",
            "columns": [
                "使用環境",
                "亜鉛の最小厚さ（µm）",
                "代表的な環境",
                "Type V 光沢（白さびまでの時間）",
                "Type II 有色（白さびまでの時間）",
                "Type VI 有色（白さびまでの時間）"
            ],
            "rows": [
                {
                    "使用環境": "SC1",
                    "亜鉛の最小厚さ（µm）": "5",
                    "代表的な環境": "屋内、乾燥",
                    "Type V 光沢（白さびまでの時間）": "72",
                    "Type II 有色（白さびまでの時間）": "96",
                    "Type VI 有色（白さびまでの時間）": "120"
                },
                {
                    "使用環境": "SC2",
                    "亜鉛の最小厚さ（µm）": "8",
                    "代表的な環境": "屋内の湿度、軽度の曝露",
                    "Type V 光沢（白さびまでの時間）": "72",
                    "Type II 有色（白さびまでの時間）": "96",
                    "Type VI 有色（白さびまでの時間）": "120"
                },
                {
                    "使用環境": "SC3",
                    "亜鉛の最小厚さ（µm）": "12",
                    "代表的な環境": "時々の雨と結露",
                    "Type V 光沢（白さびまでの時間）": "72",
                    "Type II 有色（白さびまでの時間）": "96",
                    "Type VI 有色（白さびまでの時間）": "120"
                },
                {
                    "使用環境": "SC4",
                    "亜鉛の最小厚さ（µm）": "25",
                    "代表的な環境": "塩分または頻繁に濡れる",
                    "Type V 光沢（白さびまでの時間）": "72",
                    "Type II 有色（白さびまでの時間）": "96",
                    "Type VI 有色（白さびまでの時間）": "120"
                }
            ]
        },
        {
            "caption": "青白亜鉛と黄亜鉛では、どちらが長持ちしますか？",
            "columns": [
                "化成処理の種類",
                "化学処理",
                "白さびまでの時間"
            ],
            "rows": [
                {
                    "化成処理の種類": "Type V",
                    "化学処理": "光沢三価クロメート（青白色）",
                    "白さびまでの時間": "72 h"
                },
                {
                    "化成処理の種類": "Type II",
                    "化学処理": "有色クロメート、六価（黄色）",
                    "白さびまでの時間": "96 h"
                },
                {
                    "化成処理の種類": "Type VI",
                    "化学処理": "有色クロメート、三価",
                    "白さびまでの時間": "120 h"
                }
            ]
        },
        {
            "caption": "12.9クラスのボルトに亜鉛フレーク皮膜を指定するのはなぜですか？",
            "columns": [
                "皮膜厚さ（µm）",
                "初発赤さびまでのNSS（h）"
            ],
            "rows": [
                {
                    "皮膜厚さ（µm）": "4",
                    "初発赤さびまでのNSS（h）": "240"
                },
                {
                    "皮膜厚さ（µm）": "5",
                    "初発赤さびまでのNSS（h）": "480"
                },
                {
                    "皮膜厚さ（µm）": "6",
                    "初発赤さびまでのNSS（h）": "600"
                },
                {
                    "皮膜厚さ（µm）": "8",
                    "初発赤さびまでのNSS（h）": "720"
                },
                {
                    "皮膜厚さ（µm）": "10",
                    "初発赤さびまでのNSS（h）": "960"
                }
            ]
        },
        {
            "caption": "溶融亜鉛めっきには塩水噴霧の証明書が必要ですか？",
            "columns": [
                "規格",
                "対象範囲",
                "合格判定の基準",
                "皮膜厚さ"
            ],
            "rows": [
                {
                    "規格": "ASTM A123",
                    "対象範囲": "Articles and assemblies after fabrication",
                    "合格判定の基準": "Coating grade by steel category and thickness",
                    "皮膜厚さ": "45–100 µm average"
                },
                {
                    "規格": "ASTM A153",
                    "対象範囲": "Fasteners and hardware",
                    "合格判定の基準": "Coating class",
                    "皮膜厚さ": "Per class; not tabulated on this page"
                },
                {
                    "規格": "EN ISO 1461",
                    "対象範囲": "After-fabrication galvanizing",
                    "合格判定の基準": "Average minimum by steel thickness",
                    "皮膜厚さ": "85 µm average on steel ≥6 mm"
                }
            ]
        },
        {
            "caption": "無電解ニッケルは1,000時間に耐えられますか？",
            "columns": [
                "タイプ",
                "厚さクラス",
                "代表的なNSS",
                "代表的な用途"
            ],
            "rows": [
                {
                    "タイプ": "Type IV, mid-P (5–9% P)",
                    "厚さクラス": "SC1 5 / SC2 13 / SC3 25 / SC4 75 µm minimums",
                    "代表的なNSS": "48–96 h to red rust",
                    "代表的な用途": "バルブボディ、一般産業"
                },
                {
                    "タイプ": "Type V, high-P (above 10% P)",
                    "厚さクラス": "≥25 µm (SC3 and up); marine commonly 50 µm",
                    "代表的なNSS": "≥1,000 h to red rust; up to 2,000 h after diffusion",
                    "代表的な用途": "海洋、石油・ガス、非磁性部品"
                }
            ]
        },
        {
            "caption": "黒色酸化皮膜は屋外部品に十分ですか？",
            "columns": [
                "プロセス",
                "皮膜",
                "補助剤ありのNSS",
                "補助剤"
            ],
            "rows": [
                {
                    "プロセス": "Black oxide (MIL-DTL-13924)",
                    "皮膜": "0.5–2 µm (≈0.76 µm magnetite)",
                    "補助剤ありのNSS": "24–48 h (S26) / 24–72 h (S24) to red rust",
                    "補助剤": "油またはワックスが必須"
                },
                {
                    "プロセス": "Zinc phosphate, Type Z (MIL-DTL-16232G)",
                    "皮膜": "2–15 µm",
                    "補助剤ありのNSS": "≥72 h to red rust",
                    "補助剤": "指定油、Class 2"
                },
                {
                    "プロセス": "Manganese phosphate, Type M (MIL-DTL-16232G)",
                    "皮膜": "Heavy film, accepted by coating weight",
                    "補助剤ありのNSS": "≥48 h to red rust; DFL supplemental system 100 h",
                    "補助剤": "指定油、Class 2"
                }
            ]
        },
        {
            "caption": "屋外用アルミ筐体には粉体塗装と陽極酸化のどちらがよいですか？",
            "columns": [
                "樹脂系統",
                "厚さ（µm）",
                "代表的なNSS",
                "注記"
            ],
            "rows": [
                {
                    "樹脂系統": "Epoxy",
                    "厚さ（µm）": "60–120",
                    "代表的なNSS": "1,000+ h",
                    "注記": "三系統中で最も長時間"
                },
                {
                    "樹脂系統": "Polyester",
                    "厚さ（µm）": "60–120",
                    "代表的なNSS": "500–1,000 h",
                    "注記": "屋外で一般的な選択"
                },
                {
                    "樹脂系統": "Hybrid (epoxy-polyester)",
                    "厚さ（µm）": "60–120",
                    "代表的なNSS": "500–800 h",
                    "注記": "両者の中間"
                }
            ]
        },
        {
            "caption": "装飾クロムの下地にはどのくらいのニッケルが必要ですか？",
            "columns": [
                "相違点",
                "出典A",
                "出典B",
                "本ページでの扱い"
            ],
            "rows": [
                {
                    "相違点": "Black oxide + oil salt-spray interval",
                    "出典A": "24–48 h (S26)",
                    "出典B": "24–72 h (S24)",
                    "本ページでの扱い": "両方の区間を本表に記載。寸法は保守的な24 h側で決定"
                },
                {
                    "相違点": "ASTM B633 salt-spray hours",
                    "出典A": "Type II 96 h / Type V 72 h / Type VI 120 h to white rust (S10, S11, S12 agree)",
                    "出典B": "Type I 48 h / Type II 240 h to red rust (S13, single source)",
                    "本ページでの扱い": "表は三出典で一致した値を使用。S13はここに隔離し、表には入れていない"
                },
                {
                    "相違点": "Zinc SC3 thickness",
                    "出典A": "12 µm (S10, S11, S12)",
                    "出典B": "13 µm (S15, rounding of 0.0005 in)",
                    "本ページでの扱い": "表は12 µmを採用。丸めの件は脚注に記載"
                },
                {
                    "相違点": "Type II anodize salt spray",
                    "出典A": "Sealed 336 h per MIL-PRF-8625F (S1, S3, S4)",
                    "出典B": "Up to 168 h (low-authority SEO page)",
                    "本ページでの扱い": "規格どおり336 h。SEO上の数値は採用しない"
                },
                {
                    "相違点": "HDG salt-spray hours",
                    "出典A": "Not specified by the standard — accepted by thickness grade (S14, S15, S16)",
                    "出典B": "500 h+ to red rust (S26, supplier data)",
                    "本ページでの扱い": "表では規格が沈黙している旨を記載。代表値は別途記載"
                }
            ]
        }
    ]
}